Authors
T. N. Svetlakova
Perm State National Research University, Bukireva str.-15,, Perm, Russia
S.V. Boronnikova
Perm State National Research University, Bukireva str.-15,, Perm, Russia
Yu. A. Yanbaev
Bashkirian State Agrarian University, 50-letiya Oktyabrya str.-34,, Ufa, Russia