See also: N.A. Savich, N.A. Armand, A.I. Efimov, S.S. Matyugov, A.G. Pavelyev, L.N. Samoznaev, V.M. Smirnov, O.I. Yakovlev, Yu.V. Gulyaev
PACS: 94.20.-y, 96.50.Ci, 96.30.-t