MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 27, no. 4, page. 245 - 248, 2000-11-20
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 48, no. 11, page. 1935 - 1942, 2000-11
IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION, vol. 147, no. 5, page. 412 - 416, 2000-10