APPLIED PHYSICS LETTERS, vol. 83, no. 13, page. 2635 - 2637, 2003-09-29
PHYSICAL REVIEW LETTERS, vol. 86, no. 15, page. 3404 - 3406, 2001-04-09
APPLIED PHYSICS LETTERS, vol. 77, no. 23, page. 3824 - 3826, 2000-12-04
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, vol. 83, no. 7, page. 1699 - 1702, 2000-07