See also: A.K. Zvezdin, O.M. Tatsenko, V.D. Selemir, V.V. Kostyuchenko, V.I. Plis, A.I. Popov, I.A. Lubashevskii, R.Z. Levitin
PACS: 61.46.+w, 75.50.Xx, 75.30.-m, 75.90.+w