M.L. Akimov - Ph. D. (Phys.-Math.), Assistant, Lomonosov Moscow State University P.A. Polyakov - Dr. Sc. (Phys.-Math.), Professor, Faculty of Physics, Lomonosov Moscow State University. E-mail: polyakovpa@mail.ru N.N. Usmanov - Ph. D. (Phys.-Math.), Senior Research Scientist, Faculty of Physics, Lomonosov Moscow State University. E-mail: usmaserg@yahoo.com