OPTICS LETTERS, vol. 32, no. 8, page. 906 - 908, 2007-04-15
OPTICS COMMUNICATIONS, vol. 282, no. 10, page. 2085 - 2087, 2009-05-15
OPTICS EXPRESS, vol. 18, no. 18, page. 19156 - 19162, 2010-08-30