Author: Julia Vladimirovna Zajtseva. Candidate of sciences in economics, associated professor, department of Mathematical Methods and Computer Science in Economics of the Volgograd State University, Volgograd, Russia.
E-mail: zaytseva_julia@rambler.ru
Phone: 89178411942

Author: Maria Alexandrovna Latysheva. Graduate student, assistant, department of Mathematical Methods and Computer Science in Economics of the Volgograd State University, Volgograd, Russia.
E-mail: maria-eisfeld@yandex.ru
Phone: 89177203044

Status: the paper is published in Russian; the correspondent reference and Russian version are given in the previous subject of this forum.