JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 357, no. 11, page. 2302 - 2305, 2011-06
JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 354, no. 27, page. 3107 - 3112, 2008-06-01
JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 353, no. 13-15, page. 1350 - 1353, 2007-05-15
JOURNAL OF APPLIED PHYSICS, vol. 98, no. 2, 2005-07-15
JOURNAL OF MATERIALS RESEARCH, vol. 16, no. 5, page. 1318 - 1324, 2001-05
JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 253, page. 23 - 29, 1999-08