MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 50, no. 11, page. 2989 - 2992, 2008-11
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 49, no. 6, page. 1447 - 1449, 2007-06
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 48, no. 4, page. 789 - 791, 2006-04