66th Scientific Conference with International Participation


Official Languages of the Conference


The official languages ​​of the conference are English,French and Bulgarian!

Applicants who until now have sent their manuscripts in another language, such as: Russian, French, German, Italian or other should seek help and translate the manuscript in English, French or Bulgarian!

Some manuscripts selected by Editorial Board presented in English will be published in theinternational journal Food Scientific and Applied Biotechnology, year 2020, and volume 3, Issues 1 or 2

The manuscripts presented in English/ French that have successfully passed the review process will be published in the Scientific Works of UFT, year 2019, and volume 66, Issue 1.

The manuscripts presented in Bulgarian will be send for publication in the magazine "Food Processing Industry", 2020. We note that this magazine has limited publishing capacity of 24 scientific articles per year and the scientific areas out of the journal scope are: Computer Systems and Technologies, as well as automation and robotization, electronics and electrotechnics, fundamental research in the natural-mathematical and human sciences!

We do ask all our partners, both foreign and from Bulgarian universities and research institutes to comply with this mandatory requirement!

We ask teachers of UFT primary units to provide the necessary assistance to their foreign partners to translate their scientific reports in English or Bulgarian language, if requested!

Applications for participation in languages other than the two official languages of the 65th Anniversary International Conference "Food Science, Engineering and Technology - 2018" will be rejected and will not be published!

We ask teachers of primary units to provide the necessary assistance to their foreign partners to translate their scientific reports in English or Bulgarian language, if requested! Applications for participation in languages other than the three official languages of the66th Scientific Conference with international participation “Food Science, Engineering and Technologies’ 2019” will be rejected for publication!



Types of Communications Presented on the Conference


- Plenary reports (20 - 25 min and up to 20 formatted pages - no more than 100,000 characters with whitespace incl. graphs, tables, figures, references, thanks etc.). They are presented by invited speakers;


- Short oral presentations (8 -10 min - 8 formatted pages - no more than 30,000 characters with whitespace incl. graphs, tables, figures, references, thanks etc.). They are presented by delegates (the author or one of the co-authors), according to the stated desire for authorship;


- Posters (must be submitted by at least one delegate - co-author).



Manuscript acceptance procedure

There are no restrictions one delegate to participate in n the authors' collectives in more than one manuscript. It is permissible for authors to submit three or more manuscripts, but a separate fee must be paid for each of them.

All requests must be submitted electronically to the electronic platform of the Conference on site:;

The materials must be in English, French or Bulgarian languages, only!

The materials have to be prepared according to the instructions to participants following the template file;

The materials will be evaluated for their technical compliance with the paper layout template!

Manuscripts that do not comply with the technical paper layout template will be returned to the authors for corrections, and if this is not done within the specified times, they will be rejected and will not be accepted for printing.

The materials will be judged for style and spelling of language used. Manuscripts which do not conform will be returned to the authors for corrections, and if this is not done within specified time limits will be rejected and will not be accepted for publishing;

The manuscripts undergo a technical, linguistic and stylistic line will be admitted to the procedure of an independent peer review. It will be anonymous and will be conducted by two independent reviewers who will not know the authors names and affiliations;

After the independent peer reviewing scientific communications presented to the Bulgarian language with a summary in English or both in English that are rejected will not be published in scientific journals. Abstracts of these research reports will be published in booklet Abstracts of the 66th Scientific Conference with international participation “Food Science, Engineering and Technologies’ 2019”, according to the program, i.e. for them the involvement will be a scientific communication that is not printed in full text;

After the independent peer reviewing, approved scientific reports and communications presented in Bulgarian language with a summary in English will be published in one of issues of the magazine “Food Processing Industry” in 2020, which is reviewed in Food Science and Technology Abstracts - FSTA (International food information Service - IFIS Publishing), which works with databases: EBSCO, IHS, ProQuest, CAS, Thomson Reuters, Wolters Kluwer, HINARI and AGORA;

After an independent review, the submitted in English manuscripts (recommended by the authors of these corrections, if any) will be published in the „Scientific Works of UFT”, year 2019, volume 66, issues 1, , 66th Scientific Conference with international participation “Food Science, Engineering and Technologies’ 2019” . The official edition of the journal will be sent for reference to different information bases data, including to FSTA, EBSCO, and others. The goal is to reach the referral criteria in the ISI Web of Knowledge (Thomson Reuters) and Scopus (Elsevier) databases.

The best scientific reports and posters will be invited for publishing in one of the next issues of international journal "Food Science and Applied Biotechnology"!

Plenary reports of invited speakers (invited by the Editorial Board) will be printed in "Scientific works of UFT," Year 2019, Volume 66, Issues 1, if they are presented in English, after passing through procedures of technical, linguistic and stylistic consistency and scientific peer review. If the report has been the Bulgarian language with a summary in English will be published in one of 2020 year issues of the magazine “Food Processing Industry”, after passing through the same procedures indicated above.



Instructions for Authors


The authors who are planning to present oral presentations or posters to the 66thScientific Conference with international participation “Food Science, Engineering and Technologies’ 2019”, resp. to the journal of the University of Food Technologies - Plovdiv “Scientific Works of UFT” have to prepare their manuscripts following the instructions bellow:



Yearbook journal of the University of Food Technologies “Scientific Works of UFT” (SWUFT) welcomes the submission of manuscripts from various areas of food science, engineering and technology worldwide. The proposed manuscripts must be original, must not have been published in full or in part, or accepted for publication in another scientific journal or proceedings of scientific conferences, congresses, seminars, colloquia and so on. The manuscript should be brought to the attention the editorial board of the 66th Scientific Conference with international participation “Food Science, Engineering and Technologies’ 2019”, respectively of “Scientific Works of UFT” being posted to our electronic platform. Sending manuscripts should be done electronically only. Make sure that your manuscript does not exceed more than 8 formatted pages format A4, two columns (except the first page (including title, authors, their institutions, the short title, abstract and keywords), single spacing (font Times New Roman 11), roughly equal to 4,500 - 5,000 words or 30,000 characters with spaces. These pages should include the presented graphs and tables. Manuscripts submitted to the editorial board of the 66th Scientific Conference with international participation “Food Science, Engineering and Technologies’ 2019”, respectively of “Scientific Works of UFT” will be subjected to an independent peer review before being published. The purpose of peer review is independent readers to ensure that the manuscripts were judged acceptable by competent and independent professionals. The process often leads to desired changes and to improve the quality of the manuscripts.

Manuscript Outlines

For non-English speaking authors it is highly recommended to put their manuscripts for English language editing before submission. Manuscripts with no enough English standards will be rejected before scientific evaluation.

Manuscripts prepared for to 66th Scientific Conference with international participation “Food Science, Engineering and Technologies’ 2019”, respectively of “Scientific Works of UFT” should be arranged in the following order:

First (Title) page - text arranged in one column. The title page includes:

1.Title - up to 12 words in Times New Roman font 14 (Bold).

2.Name (-s) of the author (-s) - Times New Roman font 12 (Regular).

3. Author’s affiliations - Times New Roman font 10 (Italic).

4. Full details of the corresponding author (names, scientific degree, titles, department, faculty, institution, mailing address, telephone, mobile, fax, E-mail) - Times New Roman font 10, (Italic).

5. Running title - 5 to 8 words - Times New Roman font 11 (Bold).

6. Abstract - up to 250 words in Times New Roman font 11 (Regular).

7. Practical Application or Fundamental Innovation - up to 100 words - Times New Roman font 11 (Regular).

8. Keywords – 3 to 5 words or phrases of three words - Times New Roman font 11 (Regular).

Main text - formatted in two columns - Times New Roman font 11 (Regular). The main text of the article includes:

9. Introduction. Include a review of the available literature, conclusion of literary overview, purpose and tasks of the study.

10. Materials and Methods / Methodology.

11. Results.

12. Discussion.

13. Acknowledgements.

14. References.

     Presentation of scientific data - text, tables and figures arranged in one column - Times New Roman font 11 (Regular). Presented scientific evidences include:

15. Tables.

16. Figures - graphics, pictures (photographs), charts, and etc.

Title and Name (s) of Author (s)

The title should represent the article's content and facilitate retrieval in indices developed by secondary literature services. A good title should:

1) clearly identify the significance of the study;

2) indicate the purpose of the study and

3) give important and high-impact words early.

The reader usually decides to read an article based on its title. Besides being descriptive, titles should be short. It is recommended that the title should not exceed 12 words, except in some unusual specific circumstances.

A title containing fewer than 5 words probably should be expanded. The meaning and order of words in a title are also important. Do not start the title with low-impact words such as "Effect of …" or "Influence of …". Instead, concentrate on the subject and findings of the research. The title must be useful in itself as a label. The terms in the title should be limited to those words that give significant information about the article's content.

Many readers peruse the titles in a table of contents to decide whether or not to turn to a given abstract. That's why the title should direct interest of those readers. Highly specific, narrow titles with words understandable only to specialists will be passed over. Furthermore, literature searchers will ignore titles that are incomprehensible to all but a few individuals.

Titles should never contain abbreviations, chemical formulas, or proprietary names, and authors should avoid using unusual or outdated terminology.

For economy of space, common names of chemical and crops should be used in titles. If a crop or microorganism has no common name, then the scientific name (genus and species) is used.

Each manuscript must be accompanied by a running title of 50 character and /or spaces should be provided.

The authors’ names and their affiliations should be written under the title. Information for a complete and accurate address (-es) of the affiliations of the authors is also required. It is necessary for the corresponding author to provide institutional affiliation and e-mail address. One of the authors indicated with an * as the corresponding author.

Other information, such as grant funding, may be included before the date of receiving the manuscript in paragraph “Acknowledgement” at the end of the paper. If there is only one author or if all authors have the same address, the name(s) is (are) not repeated in the author and paper documentation.



A person reading the abstract should be able to tell quickly the value of the report and whether to read it further. In many cases, more people will read the abstract than will read the entire report. Thus, the abstract has the dual function of supplying information to those who will read the entire report and to those who will not read the entire paper.

The abstract should be a suitable literary adjunct to the printed paper. It should be written after the paper is completed and should be consistent with statements in the paper. To some extent, the abstract will repeat wording in the paper, but because it is sometimes read immediately before the introduction or other main sections, it should not be a tedious recapitulation.

On the other hand, the abstract must be completely self-explanatory and intelligible in itself. It should include the following:

1. Reason for doing work, including rationale or justification for the research.

2. Objectives and topics covered.

3. Brief description of methods used. If the paper deals mainly with methods, give the basic principles, range and degree of accuracy for new methods.

4. Results (represents the trends of the most important results of the study);

5. Conclusions.

The abstract also should call attention to new items, observations and numerical data. Abstract should be informative. Expressions such as "is discussed" and "is described" should rarely be included. Specific rather than general statements must be used, especially in the methods and results sections of the abstract. For example, do not write "two rates of P" but write "rates of 40 and 80 kg of P ha-1".

The abstract should not exceed 250 words, and is not divided into paragraphs. It should not include bibliographic, figure, or table references. Equations, formulas, obscure abbreviations and acronyms are also inappropriate. The scientific names of plants, insects, etc., full chemical names and identification of soil, if the soil type is a factor in interpreting the results, must be included in the abstract when the common names are first mentioned.

If the manuscript is prepared on Bulgarian, the authors should prepare an English translation of the abstract, which will be published at the beginning of the article. However, for authors who are not native English, the translation have to be made by the partner primary unit of the UFT, who works with foreigners, sent the paper. In exceptional cases, the translation will be done by the editorial board of the 66th Scientific Conference with international participation “Food Science, Engineering and Technologies’ 2019”, respectively to "Scientific Works of UFT."



A list of three to five keywords from the manuscript must be supplied. Keywords should include the topic investigated and special techniques used. Keywords should be informative without reference to the main text. It is advisable keywords not to repeat the terms from the title.



The article should begin by clearly identifying its subject. The author should state the hypothesis or definition of the problem the research was designed to solve. A reader is given orientation to the research being reported by brief reference to previous concepts and research. References to literature should be limited to information that is essential to the reader's orientation. Most readers do not need long literature reviews, especially of old references, if newer ones are available, or to be convinced of the importance of the research. The purpose of the introduction is to supply sufficient background information to allow the reader to understand and evaluate the results of the present study without needing to refer to previous publications on the topic.

Introductions should be short and include:

1. A brief statement of the problem that justifies the work, or the hypothesis on which it is based.

2. The findings of others that will be challenged or developed.

3. An explanation of the general approaches and objectives. This part may indicate the means by which the question was examined, especially if the methods are new.


Material and Methods

The 66th Scientific Conference with international participation “Food Science, Engineering and Technologies’ 2019”;, resp. to SW-UFT will publish manuscripts which are based on experimental and survey data and theoretical analyses, provided that acceptable results are obtained. The purpose of this section is to give sufficient procedural details so that a competent scientist can repeat the experiments.

For materials, the authors should supply the appropriate technical specifications and quantities and source of method of preparation. If a commercially available product is used, the name and address of its manufacturer should be given parenthetically after it is first mentioned. If necessary, the pertinent chemical and physical properties of the reagents should be listed. Chemical rather than trade names are preferred. Any plants, animals, other organisms and soils not mentioned in the abstract should be identified accurately by genus, species, cultivar, soil classification and special characteristics.

Methods should be cited by a reference(s) if possible. If the techniques used are widely familiar, write only their names. If a method is modified, an outline of the modification should be given unless the modification is trivial. Give details of unusual experimental designs or statistical methods. Field works in agronomy and plant breeding should be based on, at least, two years data. This section may be arranged chronologically, by a succession of techniques, or in another manner. This section may include tables, graphs, charts and cat overall figures.



A common fault in the results section is to repeat in prose what is already clear from a cursory examination of the graphics. If the tables and figures are well constructed, they will show both the results and the experimental design.

Tables, graphs and other illustrations in the results section should provide a clear understanding of representative data obtained from the experiments. Data include in illustrations and tables should not be extensively discussed in the text, but significant findings should be noted. When only a few determinations are presented, they should be treated descriptively in the text. Repetitive determinations should be presented in tables or graphs.

The objective of each experiment should be made clear in the text call attention to special features, e.g.; one quantity being greater than another one, result is linear across a range, or the optimum value, etc.

Finally, the results should be related to one another. Frequently, this causes the results section to be combined with discussion section.

The editorial board does not recommend such combination of the two sections.



The discussion section interprets data presented in the results section, giving particular attention to the problem, or hypothesis, presented in the introduction. A good discussion will contain:

1. Principles, relationships and generalizations that can be supported by the results.

2. Exceptions, lack of correlation and definition of unsettled points, gap areas needing further investigation.

3. Emphasis on results and conclusions that agree or disagree with other work(s).

4. Practical as well as theoretical implications.

5. Conclusions, with summary of evidence for each one.

The discussion section, if not combined with the results section, should not recapitulate results, but should discuss their meaning. The reader should be told how the results provide a solution to the problem stated in the introduction or given as the objective of the work. The work should be connected with previous work, with an explanation of how and why it differs or agree. References should be limited to those that are most pertinent. Older references should be omitted if they have been superseded by more recent ones.

Speculation is encouraged, but should be reasonable, firmly founded in observation and subject to tests. Where results differ from previous results for unexplained reasons, possible explanations should not be laboured.

Controversial issues should be discussed clearly and fairly.

A common fault of discussion section is a tendency towards too much contemplation of nonessentials. Only discussion that illuminates significant areas should be presented.


Conclusion (-s)

Obligatory the manuscripts should include a section Conclusions. Authors should include some important conclusions that originate from the results obtained in the study. These findings should be carefully formulated so readers can identify and understand them.


Acknowledgement (s)

In this section, the author(s) may wish to thank some research institutions, companies, or governmental bodies or people who have contributed or financially supported the research from which the manuscript is derived.



The reference section lists the literature cited in the paper. Authors are encouraged to cite only published, significant and up-to-date references in their papers. This section is discussed later in more detail.



Details of Manuscript Preparation


The manuscript should be submitted in electronic format have to be posted on the electronic platform of the conference It must be written in Times New Roman font 11 with double spacing (except the title page and pages with tables or figures that are single spacing). The guidelines are as follows:

1. Requires use single spacing between the lines when writing all sections of the article, including footnotes (if any), references, data in tables, and captions to figures and tables. Use only one side of the sheet. Indent the right of each paragraph is indicated in the mock file.

2. Deletion of a word or two (if the editorial corrections any) should be clearly marked on the original manuscript.



The manuscript cannot be larger than 8 pages formatted in two columns (54 lines x 100 characters with spaces) or total ≤ 30,000 characters. Tables, figures, graphs, and photographs should be submitted on separate pages at the end of the manuscript and allow reduction of the original 40 to 60%.



Authors should follow mock file of the publication, which is preparing the manuscript. The main titles in the text, e.g. Materials and Methods are introduced in the main text, because as shown in the mock file. Medium importance titles and secondary titles are printed with uppercase and lowercase letters. Using headings can help readers, but excessive use of subtitles is very distracting. Do not overdo it with multiple subtitles!



Captions of the figures should be typed centred beneath them. Allowed figures below are presented on a separate page to allow reduction of 40 to 60% and be legible after reduction. Page numbers with figures should follow the chronological numbering of pages in manuscript. The table captions should be printed centred above the tables. Not required each table is a separate page! The words "Figure" and "Table" have to write without abbreviation in the headlines.



Authors should avoid the use of footnotes. A necessary footnote in the text may be a government disclaimer in reference to a named commercial product or a mentioned trade name.



Only literature that is available through libraries can be cited. Other material, such as personal communications or unpublished data, should be given in the text as parenthetical matter. Material submitted to but not accepted by a journal or other publications is considered to be unpublished data. Include the source of data and the date (e.g. А. Е. Нansen, 2007, personal communication). Authors are encouraged to cite only significant and published references. Abstracts, theses or dissertations, and secondary material should be carefully examined by authors before including them in the reference section as many of these are later published in sources that are more easily obtained by readers. If possible, authors should cite the more accessible source of these contributions.

Two sources of error occur in reference citation:

Inaccurate copying of the bibliographic information and compilation of the reference section after the paper is written. Authors, when copying the publication data from a document, should verify their final product against the document. The title of the reference, its author, and other information should exactly match that shown on the original document. When in doubt, the author should consult a reference librarian for the correct bibliographic citation of difficult material. Readers should be able to obtain cited references by presenting the list to a librarian.

The second type of error occurs when authors either (i) do not include a reference cited in the manuscript or have omitted a reference from the text and have left it in the reference list, or (ii) the names and dates in the reference list do not agree with those in the text. Authors are urged to check the alphabetical reference list against the citations in the body of manuscript before submitting the manuscript for publication.

One method of giving references in the text is acceptable. This is a name-year system (e.g. Smith, 1996; CSSA, 1997). For two authors, name both: Cookey & Monro (2009). With three or more authors, use et al.: De Smeet et al. (2012). For two or more article by the same author(s) in the same year, designate them as follow: Plook (2014a,b) or Jasey et al. (2015a,b).

Each reference to a periodical publication must include, in order, the name(s) of author(s) year of publication, full title of the article, publication in which it appears volume, issue/number and inclusive page numbers.

Reference to a book, bulletin, governmental document, or conference proceeding must give the name(s) of the author(s), year, title, name(s) of editor(s) if appropriate, edition, if other than the first, location and dates (if applicable), publisher, city of publication, and number of the volume (if two or more). If specific pages in book (not entire chapters) are cited, mention them in the text: Worker (2003, p.75).

Publications without consecutive pagination (i.e. each issue within the volume begins with page 1) should include the issue number: 11(2): 65-79.

Examples for citation of different type of references

Articles in English with a DOI number:

Berkov S., Pavlov A., Ilieva M., Burrus M., Popov S., Stanilova M. GC-MS of alkaloids in Leucojum aestivum plants and there in vitro cultures. Phytochemical Analysis, 2005, 16(2): 98-103.

Articles in English without a DOI number:

Ramirez-Ramirez G., Chassagne D., Feuillat M., Voilley A., Charpentier C. Effect of wine constituents on aroma compound sorption by oak wood in a model system. American Journal of Enology and Viticulture, 2004, 55(1): 22-26.

Articles in the original language other than English:

Vlahova-Vangelova D., Balev D., Dragoev S. Morphological changes of m. Longissimus dorsi during acid marinating with sodium citrate. Agricultural Sciences, 2013, 5(14): 151-156. [in Bulgarian]

Articles published online ahead of print version as an Early View:

Yu H.Y., Lee S.-J., Lee S.Y., Lee S.K., Hur S.J. Effect of dietary bioactive compounds and biopolymer encapsulated lipids on metabolism of lipids in high fat diet-fed mice. European Journal of Lipid Science and Technology, Version of record online: 30 December 2016. In press.


Lawrie R. A. The storage and preservation of meat III. Direct microbial inhibition. In: Meat Science (Fourth Edition). Elsevier Ltd., Pergamon Press Oxford, New York, Toronto, Sydney, Paris, Frankfurt, 1985, рр. 159–168, Print ISBN: 978-0-08-030789-3.

Textbooks and handbooks:

Ray B., Bhunia A. Fundamental Food Microbiology (Fifth Edition). CRC Press, Taylor & Francis Group. 2013, 663 pages. Print ISBN: 978-1-4665-6443-5, eBook ISBN: 978-1-4822-0866-5

Chapter in a book:

Dzhambazova T., Badjakov I., Dincheva I. Georgieva M., Tsvetkov I., Pavlov A., Marchev A., Mihalev K., Ivanov G., Kondakova V., Batchvarova R., Atanassov A. New Approaches for Detection of Unique Qualities of Small Fruits. In: Omics Technologies and Crop Improvement (N. Benkeblia Ed.). CRC Press, Taylor & Francis Group. 2014, рр. 187–208, Print ISBN: 978-1-4665-8668-0, eBook ISBN: 978-1-4665-8669-7, DOI: 10.1201/b17573-9

Chapter in a book from a book series:

Mai D.S., Hoang N.K. Impact of climate change on foodborne pathogens. In: Foodborne Pathogens and Food Safety (Md. Latiful Bari, Dike O. Ukuku Eds). Food Biology Series, CRC Press, Taylor & Francis Group. 2015, рр. 156–167. Print ISBN: 978-1-4987-2408-1, eBook ISBN: 978-1-4987-2410-4


Grivetti L.E., Shapiro H.Y. Eds. Chocolate, History, culture, and heritage. John Wiley & Sons, Inc., 2009. Available from:

Guides and manuals as e-books:

SAS/STAT user's guide, v. 9.3. Cary, NC, USA, SAS Institute, Inc. 2011. Available from:


Hermund D.B. Extraction, characterization and application of antioxidants from the Nordic brown alga Fucus vesiculosus. PhD thesis by National Food Institute, Technical University of Denmark, 2016 [in Danish]


Pandey R., Ratnani K., Ahmed S.,Williams J. Direct conversion of methane to hythane. US Patent 5516967, 1996.

Symposia, congresses, proceedings:

Leboš Pavunc A., Kos B., Beganović J., Gjuračić K., Šušković J. Selection of probiotic strains from Croatian traditional fresh cheese. Book of Abstracts of the 5th Central European Congress of Food, Bratislava, Slovakia, 2010, p. 176.

Arrange the list alphabetically by the surnames of authors.

Two or more articles by the same author(s) are listed chronologically; two or more in the same year are indicated by the letters a, b, c, etc.

All single-author works of a given individual should precede multiauthor article of which the individual is senior author. Entries with the same senior author (e.g. Shotwell below) should be organized by alphabetizing surnames of succeeding co-authors and then by year, when the name repeated exactly (see entries 3 and 4 below).

1. Schooler, R.T. (2014).

2. Schooler, R.T., V. G. Auel, F. Y. Hensel (2002).

3. Schooler, R.T., T. D. Baker, L. M. Daubler (2013).

4. Schooler, R.T., T. D. Baker, P. K. Gulen (2014).

5. Schooler, R.T., T. D. Baker, I. H. Van de Raith, P. K. Gulen (2013).

6. Schooler, R.T., Z. B. Knowler, P R. Goulden, W.V. Jonson, K. D. Brossley (2011).

7. Schooler, R.T., W. Y. Zeng (2014).

Do not capitalize the title of the article except proper names and the first letter of the words of the title.

The titles of periodicals (journals) and books should not be curtailed, and must be written in full.



The SI system is adopted as standard. As for abbreviations if any non-standards are to be used they should be defined in the text.



First mention of tables in text must be in sequential order; indicate first mention of each table in margin of manuscript.



Figures are of two kinds: line drawings and photographs. Line drawings must be drawn using intense black on white: photographs must be of good contrast and in sharp focus throughout. In addition to the usual line-drawn graphs, treat complicated formulas, flow diagrams, metabolic schemes and large or complex tables as figures. Indicate the first mention to any figure in the text. Use example [7] to specify the number of formulas.

Figures are photographically reproduced, nearly always at a reduced size from the material provided by the authors. Plan for maximum reduction wherever possible, figures will be reduced to fit one journal column (69 mm). All letters, numbers and symbols thus must be large enough in original to be at least 1.5 mm high after reduction. Use standard symbols starting with: a, b, c, d, f.



Page author proofs will be sent to authors for checking before publication. Alterations other than correction of printer's error will be allowed only at the editor's discretion. Manuscripts after being corrected must be returned to the editorial office within 15 days, otherwise the editor reserves the right to correct the proofs himself and to send the material for publication.