MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 49, no. 11, page. 2838 - 2841, 2007-11
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 49, no. 10, page. 2552 - 2555, 2007-10
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 49, no. 6, page. 1447 - 1449, 2007-06