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JOURNAL OF APPLIED PHYSICS, vol. 90, no. 9, page. 4407 - 4410, 2001-11-01

JOURNAL OF APPLIED PHYSICS, vol. 95, no. 9, page. 4691 - 4704, 2004-05-01

JOURNAL OF APPLIED PHYSICS, vol. 92, no. 8, page. 4820 - 4824, 2002-10-15

JOURNAL OF APPLIED PHYSICS, vol. 94, no. 3, page. 1748 - 1752, 2003-08-01

JOURNAL OF APPLIED PHYSICS, vol. 100, no. 9, 2006-11-01