A.A. Kolyada - Dr.Sc. (Phys.-Math.), Associate Professor, Chief Research, Scientntict A.N. Sevchenko Institute of Applied Physics Problems of Byelorussian State University (Minsk) E-mail: razan@tut.by P.V. Kuchynski - Dr.Sc. (Phys.-Math.), Associate Professor, Director of A.N. Sevchenko Institute of Applied Physics Problems of Byelorussian State University (Minsk) E-mail: niipfp@bsu.by N.I. Chervyakov - Dr.Sc. (Eng.), Professor, Head of Department of the Applied Mathematics and Mathematical Modeling, Institute of Mathematics and Natural Sciences, North Caucasus Federal University (Stavropol) E-mail: Chervyakov@yandex.ru