JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 353, no. 16-17, page. 1676 - 1680, 2007-06-01
JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 353, no. 13-15, page. 1251 - 1254, 2007-05-15
JOURNAL OF APPLIED PHYSICS, vol. 96, no. 9, page. 4827 - 4832, 2004-11-01
CHEMICAL PHYSICS LETTERS, vol. 368, no. 5-6, page. 625 - 629, 2003-01-24
JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 278, no. 39816, page. 137 - 144, 2000-12