JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 357, no. 11, page. 2403 - 2408, 2011-06
JOURNAL OF NON-CRYSTALLINE SOLIDS, vol. 357, no. 11, page. 2316 - 2319, 2011-06
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, vol. 28, no. 5, page. 1283 - 1288, 2011-05