Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286), Hong Kong, China. volume 6; IEEE: pp. 3245-3248; ISBN 978-0-7803-5164-6
1998 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.98EX184), Waltham, MA, USA. IEEE: pp. 85-88; ISBN 978-0-7803-4955-1