PHYSICAL REVIEW B, vol. 74, no. 19, 2006-11
APPLIED PHYSICS LETTERS, vol. 89, no. 13, 2006-09-25
JOURNAL OF APPLIED PHYSICS, vol. 100, no. 4, 2006-08-15
APPLIED PHYSICS LETTERS, vol. 89, no. 3, 2006-07-17
PHYSICAL REVIEW B, vol. 73, no. 3, 2006-01