See also: D.V. Korol’kov, A.A. Stotskii, A.M. Finkel’stein, P.A. Fridman, Yu.N. Pariiskii, B.Sh. Perkal’skis
PACS: 07.60.Ly, 06.30.Bp, 95.75.Kk, 93.85.+q