See also: D.S. Ponomarev, D.V. Lavrukhin, K.I. Zaytsev, I.E. Spektor, V.V. Kveder, A.E. Yachmenev, R.A. Khabibullin, V.N. Kurlov
PACS: 07.57.-c, 42.30.Wb, 84.40.-x