See also: E.V. Shpol’skii
PACS: 33.15.Bh, 31.15.Hz, 31.15.xh, 33.20.-t, 03.65.Fd, 02.70.Ns, 34.30.+h, 35.20.-i, 36.20.-r, 31.15.Md, 33.20.Sn, 33.15.Kr