COMMUNICATIONS AND CORRESPONDENCE

R.N. Khokha, N.S. Paramonova, L.B. Zavodnik

R.M. Fayzullina, Z.A. Shangareeva, A.V. Sannikova, A.F. Mananova, L.M. Kabirova, A.R. Idrisova

А.L. Zhitntkovskaya, T.S. Lepeshkova

Yu.N. Emelina, O.A. Vorontsova, E.K. Beltyukov

I.A. Fedorov, O.G. Rybakova