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Submitted on: 27 June 1999.
Revised on: 17 July 1999.
Accepted on: 23 August 1999.
___________________INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
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Submitted on: 24 January 2001.
Revised on: 25 March 2001.
Accepted on: 17 April 2001.
___________________INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
Submitted on: 01 January 2001.
Revised on: 22 April 2001.
Accepted on: 10 May 2001.
___________________INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
http://reply.papertrans.cn/2/132/13178/13178-26.png
Submitted on: 06 October 2002.
Revised on: 06 January 2003.
Accepted on: 25 February 2003.
___________________INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
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http://reply.papertrans.cn/2/132/13178/13178-29.png
Submitted on: 26 October 2011.
Revised on: 05 February 2012.
Accepted on: 17 February 2012.
___________________INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS