Instructions for Authors

Submission of manuscripts. Preferably, manuscripts should be sent (in triplicate) directly to a member of the Editorial Board whose field of interest is judged to be the closest to the paper's subject. In case of hesitation the authors are encouraged to consult the Editorial Office at the e-mail address given below. Manuscripts may be also submitted to the Editorial Office. Acceptance for publication will be based on a positive recommendation by a member of the Editorial Board. Upon acceptance papers prepared by TeX, LaTeX, or another software could be sent on a disk to the Editorial Office. If TeX, or LaTeX, is used, the source file can be sent by e-mail to: serdica@math.bas.bg. In both cases, the corresponding printout copy must be sent as well.

• Manuscripts should be typewritten or printed on one side of the paper, double-spaced with wide margins on A4 paper format, using black tape.
• An abstract, not exceeding 150 words, should be included at the beginning. The author(s) should provide also 2000 Mathematics Subject Classification and Key words clarifying the subject of the manuscript.
• Formulae should be typed whenever possible. Mathematical characters must be written legibly and clearly. The exact position of sub- and superscripts must be unambiguous. Authors should take care in situations which could cause confusion such as to distinguish between O (capital O) and 0 (zero), l (lower case l) and 1 (one), italic a and Greek alpha, italic w and Greek omega etc. They should also be careful about the size of capital and lower case letters. A List of Symbols should accompany those manuscripts which are not prepared by using standard mathematical editors like TeX, LaTeX or WORD. The List of Symbols has to contain all the mathematical symbols used in the paper identified typographically. Indicate also when a font different from Roman (such as German, Greek, Script etc.) is used.
• Figures and tables should be submitted on separate sheets and numbered consecutively. The authors must indicate in the margin of the manuscript where the figures or tables are to be inserted. Figures may be sent also on a disk as files in PCX or PS graphic formats.
• Footnotes should be numbered consecutively and placed at the foot of the page where they have to appear. The footnotes related to the title and author's names should not be numbered.
• References should be given at the end of the paper in alphabetical order in the following way: a) to books - author, title, location, year of publication; b) to articles in periodicals or collections - author, title of the article, title of the periodical (collection), volume, year, pagination. Abbreviations of titles of journals and periodicals should be done according to Mathematical Reviews or Zentralblatt fuer Mathematik (see e.g. most recent Mathematical Reviews Annual Subject Index).
• Manuscripts must be accompanied by the full address(es) of the author(s) and e-mail, if available.
• On a separate sheet the author(s) should give a short running title (not exceeding 60 symbols) and in the case of multiple authors they should specify an address for correspondence.
• Author(s) should keep a copy of the original manuscript.
• Manuscripts are not sent back.