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Submitted on: 30 January 2007.
Revised on: 22 April 2007.
Accepted on: 11 June 2007.
___________________IEEE Systems Journal---IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Submitted on: 26 October 2001.
Revised on: 31 January 2002.
Accepted on: 22 March 2002.
___________________IEEE Systems Journal---IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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