I.V. Zueva, V.E. Semenov, M.A. Mukhamedyarov, K.A. Petrov, S.V. Lushchekina, A.D. Kharlamova, E.O. Petukhov, V.V. Zobov, A.S. Mikhailov, S.N. Podyachev, L.F. Saifina, O.A. Minnekhanova, E. E. Nikolsky, P. Masson, V.S. Reznik  (Kazan, Russia)