MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 13, no. 4, page. 184 - 186, 1996-11
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 20, no. 5, page. 292 - 295, 1999-03-05
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 45, no. 8, page. 1252 - 1255, 1997-08
ELECTRONICS LETTERS, vol. 32, no. 20, page. 1928 - 1929, 1996-09-26
ELECTRONICS LETTERS, vol. 34, no. 10, page. 1031 - 1033, 1998-05-14