ELECTRONICS LETTERS, vol. 45, no. 14, page. 755 - 756, 2009-07-02
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, vol. 15, no. 4, page. 1122 - 1127, 2009-07
APPLIED PHYSICS LETTERS, vol. 94, no. 1, page. 11113 - 11113, 2009-01-05
APPLIED PHYSICS LETTERS, vol. 94, no. 8, 2009-02-23