See also: E.A. Ivanov, E.V. Katkova, G.M. Beskin, S.V. Karpov, V.L. Plokhotnichenko, S.F. Bondar, V.V. Sasyuk, A. Sherer
PACS: 89.60.Gg, 95.55.Cs, 96.30.Ys