Dmitry V. Melnichuk
Candidate of Physical and Mathematical Sciences,
Associate Professor of the Department of Function Theory and Stochastic Analysis,
Faculty of Mechanics and Mathematics,
Chernyshevsky Saratov State University,
83 Astrakhanskaya St., Saratov, 410012, Russia
Saratov National Research State University named after N. G. Chernyshevsky
