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Submitted on: 19 March 2003.
Revised on: 02 June 2003.
Accepted on: 07 July 2003.
___________________IEEE NETWORK---IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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Submitted on: 30 November 2012.
Revised on: 29 January 2013.
Accepted on: 24 March 2013.
___________________IEEE NETWORK---IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC