Екатеринбург ChervanevV.O. Ural State Mining University, Russia, 620144, Yekaterinburg, Kuibyshev st., 30 victor_ua@pochta.ru Read more about V.O. Chervanev KremlevAleksandrGurievich Ural Federal University, Russia, 620002, Ekaterinburg, Mira str., 19 kremlev001@mail.ru Read more about Kremlev A. G.
