JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 326, page. 410 - 415, 2003-10-01
JOURNAL OF APPLIED PHYSICS, vol. 94, no. 5, page. 2817 - 2820, 2003-09-01
JOURNAL OF APPLIED PHYSICS, vol. 93, no. 12, page. 9441 - 9445, 2003-06-15
CHEMICAL PHYSICS LETTERS, vol. 368, no. 5-6, page. 625 - 629, 2003-01-24