// <I>Proceedings<D> of the 12th international conference on Applied physics of condensed matter APCOM' 2006, Mala Lucivna, Slovak Republic, 21 - 23 june 2006. - Mala Lucivna, 2006, p. 226 - 229,
J. Kovac; L. Janos; J. Jakabovic;
I. Novotny;
D. Hasko;
K. Shtereva и др.