See also: S.B. Novikov, A.A. Ovchinnikov, O.I. Bugaenko, Yu.A. Shokin, A.M. Cherepashchuk, E.K. Sheffer, S.M. Kudryavtsev
PACS: 95.85.Sz, 97.10.Ld, 97.10.Vm, 96.30.Gc, 96.30.Hf, 96.12.Kz, 95.55.Fw