See also: H. Huck, T. Rublack, A. Oppelt, D. Melkumyan, O. Lishilin, H. Qian, M. Krasilnikov, D. Kalantaryan, I. Isaev, Ja.D. Good, M. Gross, P. Boonpornprasert, E.A. Khazanov, Y.L. Chen, F. Stephan
PACS: 29.20.-c, 29.27.Ac, 42.60.By, 42.60.-v