See also: I.N. Tilikin, N.V. Pestovskii, T.A. Shelkovenko, S.A. Pikuz, S.Yu. Savinov, V.N. Ochkin
PACS: 52.58.Lq, 52.59.-f, 52.80.Qj, 42.50.-p, 42.50.Hz, 42.65.-k