OPTICS EXPRESS, vol. 21, no. 1, page. 70 - 78, 2013-01-14
Optics Express, vol. 20, no. 3, page. 3325 - 3330, 2012-01-30
OPTICS LETTERS, vol. 32, no. 14, page. 2010 - 2012, 2007-07-15