See also: A.S. Sigov, E.A. Turov, K.P. Belov, R.Z. Levitin, V.G. Bar’yakhtar, G.A. Smolenskii, Yu.A. Izyumov
PACS: 75.30.Kz, 75.40.-s, 75.50.Ee, 75.60.Ch, 75.70.-i