Bin-­Bin Zhang
Yanka Kupala State University of Grodno.
Russian Federation

Zhang Bin-bin - Postgraduate student. 

22, Ozheshko Str., 230020, Grodno.

Yang Chen
Yanka Kupala State University of Grodno.
Russian Federation

Chen Yang - Postgraduate student. 

22, Ozheshko Str., 230020, Grodno.

I. P. Martynov
Yanka Kupala State University of Grodno.
Russian Federation

Martynov Ivan Platonovich - D. Sc. (Physical and Ma­thematics), Professor. 

22, Ozheshko Str., 230020, Grodno.