MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 49, no. 12, page. 3184 - 3187, 2007-12
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 49, no. 1, page. 199 - 201, 2007-01
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 48, no. 9, page. 1873 - 1876, 2006-09
ELECTROMAGNETICS, vol. 26, no. 3-4, page. 203 - 218, 2006-04