MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 50, no. 11, page. 2989 - 2992, 2008-11
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, vol. 17, no. 8, page. 622 - 624, 2007-08
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 49, no. 6, page. 1447 - 1449, 2007-06