http://reply.papertrans.cn/3/261/26067/26067-31.png
http://reply.papertrans.cn/3/261/26067/26067-32.png
http://reply.papertrans.cn/3/261/26067/26067-33.png
Submitted on: 11 December 1998.
Revised on: 30 December 1998.
Accepted on: 14 January 1999.
Radiophysics and Quantum Electronics
http://reply.papertrans.cn/3/261/26067/26067-35.png
http://reply.papertrans.cn/3/261/26067/26067-36.png