See also: A.A. Kuraev, B.M. Bolotovskii, Yu.V. Gulyaev, A.K. Sinitsyn, I.M. Frank
PACS: 07.57.-c, 41.20.Jb, 84.40.-x, 02.30.Yy, 41.60.Bq, 84.40.Fe