Submitted on: 01 October 1998.
Revised on: 01 November 1998.
Accepted on: 14 December 1998.
___________________INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
http://reply.papertrans.cn/2/132/13145/13145-32.png
http://reply.papertrans.cn/2/132/13145/13145-33.png
http://reply.papertrans.cn/2/132/13145/13145-34.png
http://reply.papertrans.cn/2/132/13145/13145-35.png
Submitted on: 26 April 1998.
Revised on: 10 August 1998.
Accepted on: 24 August 1998.
___________________INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS