SMJ'S RULES FOR AUTHORS Check your article for spelling, style, and grammar. Prepare your article in LATeX or AMSTeX on referring to the guidelines of Pleiades Publishing Ltd. (https://www.pleiades.online/en/authors/guidlines/). List references in order of appearance and , in case the paper is in Russian, according to amsbib.sty (http://www.mathnet.ru/poffice/amsbib.zip) See the manual at GitHub (https://github.com/SergejZnamenskij/amsbib/blob/master/amsbibmanual.pdf). References to journals should explicitely inclede the volume, issues, and pages of the cited article. Avoid bulky formulas and references in the abstract. Never use unembedded fonts in illustrations, Windows encoding, and use only type 1 fonts. Do not use the commands \intertext \noalign \handcarryover. Do not use italics, bold, special symbols, and inlined math in \tag and \eqno. All new results must be proved. Surveys should be submitted elsewhere. Submit papers through the Authors' Portal of Pleiades https://publish.sciencejournals.ru/login The files of submission must be sent in pdf and LaTeX or AMSTeX format. Never use any compression software for submission. Make illustrations black and white in the grayscale mode with resolution 212--300 dpi and use eps-format. Note the change of the publisher's policy. Your article may be accepted by way of Open Access publication. The relevant details are disclosed at the Pleiades Publishing Ltd. site: https://www.pleiades.online/en/authors/openaccess/how-to-publish/ Upon acceptance your article, fill-in and sign the Copyright Transfer Agreement (http://wwwd2/www.math.nsc.ru/smj/Copyright_Transfer_Agreement.dosx). Observe the reqirements of the Copyright Transfer Agreement: The Author (Co-authors) guarantee that the Work is original, submitted only to this Journal and/or Publisher, and have not been published previously in the English language. If the Work contains fragments of works or refer to works protected by copyright and belonging to a third party, the Author (Co-authors) must obtain the written permission of the copyright holders for all types of use and to make proper reference to the source and provide the Publisher with copies of the specified permissions. Return the scan of the signed agreement to Irina I Kozhanova, Head of the Staff of Siberian Mathematical Journal (email bee@math.nsc.ru). `