APPLIED PHYSICS LETTERS, vol. 95, no. 24, page. 241109 - 241109, 2009-12-14
APPLIED PHYSICS LETTERS, vol. 94, no. 11, 2009-03-16
APPLIED PHYSICS LETTERS, vol. 94, no. 8, 2009-02-23
APPLIED PHYSICS LETTERS, vol. 93, no. 19, 2008-11-10