See also: O.A. Kiselev, V. Bart, I.G. Mukha, L.V. Grigorenko, G.M. Ter-Akopian, Yu.L. Parfenova, V.V. Parkhomchuk, S.M. Polozov, M. Pfutzner, S.I. Sidorchuk, H. Simon, R.S. Slepnev, V. Chudoba, G.V. Trubnikov, K. Scheidenberger
PACS: 21.10.Ft, 29.20.-c, 29.25.Rm