See also: B.M. Smirnov, Ya.A. Smorodinskii, A.P. Silin, S.M. Zhebrovskii, T.O. Vreden-Kobetskaya, E.G. Maksimov, A.N. Matveev
PACS: 01.30.Vv, 01.30.Cc, 64.60.Ak, 64.60.Fr