Instructions to Authors

Instructions to Authors

1. Comptes rendus de l’Académie bulgare des Sciences (Proceedings of the Bulgarian Academy of Sciences) publishes peer reviewed short reports of original scientific results in the field of Astronomy, Mathematics, Physics, Chemistry, Biology, Geology, Geophysics, Space Sciences, Engineering Sciences, Physical Geography, Medicine and Agricultural Sciences. The papers should not be of a descriptive or polemical character and should contain only unpublished results in the respective scientific field. They can further be expanded to be published elsewhere. Manuscripts should be written in English should not exceed 8 standard typewritten pages (16 000 characters) including figures and tables (not more than 4 in total). Spelling should conform to the preferred spelling of the Shorter Oxford English Dictionary.

2. Comptes rendus also publishes Concise Review Papers (short surveys) at the invitation of the Editorial Board. The short surveys should reflect the latest achievements in a given field of knowledge. They should be presented in the form of a report according to the requirements of the journal not exceeding 20 standard pages.

3. Manuscripts (text of the article, abstract, keywords, figures and tables) should be sent as a single file in PDF format to the e-mail address of the editorial office comprend@abv.bg, along with a cover letter with the name, address and telephone number of the corresponding author. The articles in the field of mathematics must contain information for the Mathematics Subject Classification MSC 2020 (see https://zbmath.org/classification/ or https://mathscinet.ams.org/mathscinet/freetools/msc-search).

4. Each paper accepted for publication should be submitted for printing by a member of the Bulgarian Academy of Sciences (Academician or Corresponding Member).

5. After approval of the manuscript, the corresponding author should send the following files to the editorial office:

▪ File with the text of the article in MS Word format (*.doc or *.docx) or LaTeX. The text width is 135 mm and the text height is 203 mm. The font size is 11 pt Times New Roman (for LaTeX files use standard Computer Modern Fonts aka Knuth fonts). All Word files are converted to LaTeX which is the typesetting engine of the journal.

▪ Files with tables (in the same formats) – each table should be presented as a separate file. The International System of Units (SI) should be used. The decimal separator is dot (.).

▪ Separate files for each graph, illustration and photograph (format jpg, png, pdf, epswith resolution not less than 300х300 dpi). Other file formats (tif) will be converted to jpg. MS Excel files, wmf and emf files (which can be exported from some statistical software programs) as well as Corel files (ver. 16 max) are also allowable. The latter file formats can be edited by the typesetting team. Files in doc or docx formats are not acceptable. For colour files CMYK model is used and in case of RGB model conversion to CMYK will be performed. The black and white figures are converted to Grayscale model. Graphs, illustrations and photographs are indicated in the text as figures, abbreviated "Fig_xx".

▪ File with figure captions and text to tables.

6. References should contain up to 20 cited works arranged according to their order of appearance in the text. If the authors are more than three, the report lists the top three, after which et al. is added.

The family name precedes the initials of the first name in case of the first author, followed by the names of the other authors, year of publication, title of publication, the standard abbreviation of the journal according to ISO4, the volume number, the issue number, and the pages cited.

For books – name of the author(s), year of publication, the book title, the city of publication and the publisher followed by pages cited or the number of pages of the book. References should be indicated in the text by giving the corresponding numbers in square brackets.

Examples:

[1] Matzuk M. M., D. J. Lamb (2008) The biology of infertility: research advances and clinical challenges, Nat. Med., 14 (2), 1197–1213.

[2] Repovs D., P. V. Semenov (2002) Continuous selections of multivalued mappings, In: Recent Progress in General Topology II (Eds M. Husek and J. van Mill), Amsterdam, Elsevier, 423–462.

[3] Hardy G. H., J. E. Littlewood, G. Pólya (1952) Inequalities, 2nd ed., Cambridge, Cambridge University Press, 324 pp.

7. The full address of each author, complete with postal code and e-mail address, must be placed at the end of the manuscript after the References. Information for the ORCID ID and/or SCOPUS ID must be added for the corresponding author and the other authors who have ORCID and/or SCOPUS registration. Names should be written in English, with English alphabet letters only and, optionally, in original, if the author's native alphabet is a variant of the Latin alphabet.

8. The authors are offered one proofreading. Corrections are allowed only of errors made in the course of preparation of the manuscript for printing, and, as an exception, in connection with some new aspects of the problem discussed. Authors can download PDF copies of their article from the journal website: http://www.proceedings.bas.bg/

PUBLICATION FEES:

Comptes rendus de l'Académie bulgare des Sciences is funded by the Budget of the Republic of Bulgaria.

Bulgarian authors who have funding for projects pay a fee of 200 euros. In cases where their articles are without funding, they are exempt from this fee.
In the case of a mixed team of Bulgarian and foreigners (without Bulgarian funding) the foreign co-author(s) must pay half of the total fee, i.e. 100 euros.
Foreign authors owe a fee of 200 euro.

For papers submitted after January 1, 2026:

Bulgarian authors who have funding for projects pay a fee of 300 euros. In cases where their articles are without funding, they are exempt from this fee.
In the case of a mixed team of Bulgarian and foreigners the foreign co-author(s) must pay half of the total fee, i.e. 150 euros. If the Bulgarian part of the team has funding, it has to pay the other half of 150 euros. If the Bulgarian part of the team does not have funding, it is exempt from this payment.
Foreign authors owe a fee of 300 euros.