P. P. Matus
Institute of Mathematics of the National Academy of Sciences of Belarus
Belarus

Matus Piotr P. – Corresponding Member, D. Sc. (Physics and Mathematics), Professor, Chief Researcher.

11, Surganov Str., 220072, Minsk

G. Ph. Gromyko
Institute of Mathematics of the National Academy of Sciences of Belarus
Belarus

Gromyko Galina F. – Ph. D. (Physics and Mathematics), Head of the Department.

11, Surganov Str., 220072, Minsk

B. D. Utebaev
Karakalpak State University named after Berdakh; Institute of Mathematics named after V. I. Romanovsky of the Academy of Sciences of the Republic of Uzbekistan
Uzbekistan

Utebaev Bakhadir Dauletbay uli – Ph. D. (Physics and Mathematics), Associate Professor.

1, Ch. Abdirov Str., 230112, Nukus