INFRARED PHYSICS & TECHNOLOGY, vol. 53, no. 5, page. 392 - 395, 2010-09
JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 357, no. 11, page. 2219 - 2222, 2011-06
JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 357, no. 11, page. 2316 - 2319, 2011-06
JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 357, no. 11, page. 2362 - 2365, 2011-06