EUROPHYSICS LETTERS, vol. 74, no. 2, page. 348 - 354, 2006-04
PHYSICAL REVIEW B, vol. 66, no. 16, 2002-10-15
JOURNAL OF APPLIED PHYSICS, vol. 88, no. 12, page. 7056 - 7059, 2000-12-15
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 29, page. S612 - S615, 1996-11