## INFORMATION FOR AUTHORS

**Papers** should be concise, contain unpublished original material, be written in English, and prepared using any version of TeX. On the proof stage, the author will be asked to sign the copyright transfer agreement.

**Manuscripts** in the form of PDF files should be submitted here. You are also welcome to contact us by email for more information. **On acceptance of the paper**, the authors will also be asked to transmit the source file.

Recommended **format** of manuscripts: 12-point type (including references), text width 13.5 cm.

A **template file**

The amsart style: IMPAN-amsart.tex, IMPAN-amsart.pdf

The article style: IMPAN-article.tex, IMPAN-article.pdf

A **summary** of not more than 200 words, the **2000 Mathematics Subject Classification** and a list of **key words and phrases** are required.

**Figures** must be prepared in electronic form, suitable for direct reproduction. The use of very thin lines should be avoided.

**References** should be arranged in alphabetical order, and styled and punctuated according to the examples given below. Abbreviations of journal names should follow Mathematical Reviews.

Examples:

[6] | D. Beck, Introduction to Dynamical Systems, Vol. 2, Progr. Math. 54, Birkhäuser, Basel, 1978. |

[7] | R. Hill and A. James, A new index formula, J. Differential Equations 15 (1982), 197--211. |

[8] | J. Kowalski, Some remarks on J(X), in: Algebra and Analysis (Edmonton, 1973), E. Brook (ed.), Lecture Notes in Math. 867, Springer, Berlin, 1974, 115--124. |

[Nov] | A. S. Novikov, An existence theorem for planar graphs, preprint, Moscow Univ., 1980 (in Russian). |

Authors' **affiliation** should be given.

The **proofs** will be sent electronically to the corresponding author. Corrections at proof stage must be kept to a minimum.

The **Online First** version of the article will be sent to the author and published on the journal's web site before the article is assigned to an issue. This version will be freely downloadable for everybody. The author is allowed to post the “Online First” version to his/her personal web site and to any other archives.

When the paper is assigned to an issue, the **final print file** with all publication data included will also be sent to the author. The latter file will be for the author's personal use only and should not appear on any web site other than IMPAN’s.

**Offprints** of the article in batches of 25 can be purchased. They can be ordered when sending the proof corrections.

The article can also be published in **Open Access **(that is, with the final print file also freely downloadable) upon paying a fee of 300 euros. The decision should be communicated at the proof stage; the appropriate invoice will then be sent to the author.

**Address of the Editorial Office**:

Bulletin of the Polish Academy of Sciences, Mathematics

Śniadeckich 8

00-656 Warszawa, Poland

E-mail

For additional information and advice, see Guidelines for authors.