A.P. Davydov – Ph.D.(Phys.-Math.), Associate Professor, Department of Applied and Theoretical Physics,  Institute of Natural Science and Standardization of Nosov Magnitogorsk State Technical University E-mail: ap-dav@yandex.ru

T.P. Zlydneva – Ph.D.(Pedagogic), Associate Professor, Department of Applied Mathematics and Informatics,

Institute of Natural Science and Standardization of Nosov Magnitogorsk State Technical University E-mail: pmi@magtu.ru, tapazl@yandex.ru