See also: M.G. Bulatov, O.Yu. Lavrova, K.T. Litovchenko, M.I. Mityagina, M.D. Raev, K.D. Sabinin, Yu.G. Trokhimovskii, A.N. Churyumov, Yu.A. Kravtsov
PACS: 84.40.Ba, 92.10.Hm, 93.85.+q