IEEE MICROWAVE AND GUIDED WAVE LETTERS, vol. 9, no. 10, page. 419 - 421, 1999-10
IEICE TRANSACTIONS ON ELECTRONICS, vol. E82C, no. 6, page. 1018 - 1024, 1999-06
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 20, no. 5, page. 292 - 295, 1999-03-05
SEMICONDUCTOR SCIENCE AND TECHNOLOGY, vol. 14, no. 2, page. 130 - 137, 1999-02