JOURNAL OF APPLIED PHYSICS, vol. 105, no. 7, page. 7E107, 2009-04-01
JOURNAL OF APPLIED PHYSICS, vol. 107, no. 12, page. 124702, 2010-06-15
JOURNAL OF APPLIED PHYSICS, vol. 75, no. 3, page. 1410 - 1419, 1994-02-01
JOURNAL OF APPLIED PHYSICS, vol. 81, no. 2, page. 698 - 708, 1997-01-15