See also: L.M. Zelenyi, V.Yu. Popov, H.V. Malova, E.E. Grigorenko, M.V. Leonenko, M.V. Podlozko, E.P. Popova
PACS: 52.40.Kh, 94.05.-a, 91.25.Cw, 91.25.Mf, 94.20.wq