A.S. Levizov - Ph.D. (Econom.), The Vladimir state university of a name of A. and N. Stoletov. E-mail: levizov@rambler.ru
I.F. Kurbyko - Ph.D. (Phis.-Math.), Associate Professor, The Vladimir state university of a name of A. and N. Stoletov. E-mail: levizov@rambler.ru