See also: R.Z. Levitin, K.P. Belov, G.A. Smolenskii, E.A. Turov, S.A. Nikitin, Yu.A. Izyumov
PACS: 71.20.Gj, 75.30.Cr, 75.40.-s, 75.30.Kz, 75.25.+z, 75.80.+q