APPLIED PHYSICS LETTERS, vol. 79, no. 19, page. 3137 - 3139, 2001-11-05
JOURNAL OF MATERIALS RESEARCH, vol. 16, no. 11, page. 3124 - 3132, 2001-11
APPLIED PHYSICS LETTERS, vol. 78, no. 5, page. 658 - 660, 2001-01-29