JOURNAL OF APPLIED PHYSICS, vol. 96, no. 9, page. 5110 - 5116, 2004-11-01
SOLID STATE COMMUNICATIONS, vol. 129, no. 7, page. 465 - 468, 2004-02
SOLID STATE COMMUNICATIONS, vol. 127, no. 7, page. 469 - 473, 2003-08
JOURNAL OF APPLIED PHYSICS, vol. 93, no. 8, page. 4769 - 4775, 2003-04-15
MATERIALS SCIENCE FORUM, vol. 439, page. 1 - 6, 2003-01