Пенза
Mazei Y.A. Penza State University, 40 Krasnaya Str., Penza 440026tgstojko@mail.ru
Senkevich (Burdova)V.A.Penza State University, 40 Krasnaya Str., Penza 440026tgstojko@mail.ru
Stojko T.G.Penza State University, 40 Krasnaya Str., Penza 440026tgstojko@mail.ru