М.Yu. Reushev – Ph.D. (Phys.-Math.), Associate Professor,

Siberian Federal University (Krasnoyarsk)

E-mail: reuqem@mail.ru

S.L. Nikitin – Junior Research Scientist,

FIC KSC SB RAS (Krasnoyarsk)

N.N. Davletshin – Junior Research Scientist,

FIC KSC SB RAS (Krasnoyarsk)