See also: E.A. Ekimov
PACS: 62.50.-p, 81.05.ug, 81.40.Vw, 33.15.Pw, 33.50.Dq, 42.50.Ex, 61.46.-w, 61.71.U-, 63.20.kp, 63.20.Pw, 78.55.-m, 81.10.-h