See also: Yu.A. Kravtsov, B.M. Smirnov, Ya.A. Smorodinskii, A.N. Matveev, S.M. Zhebrovskii, A.P. Silin, T.O. Vreden-Kobetskaya, E.G. Maksimov
PACS: 01.30.Vv, 01.30.Cc, 05.45.Df, 75.70.Kw