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Submitted on: 07 December 2007.
Revised on: 14 February 2008.
Accepted on: 07 March 2008.
___________________IEEE TRANSACTIONS ON RELIABILITY
Submitted on: 22 August 2003.
Revised on: 29 October 2003.
Accepted on: 13 December 2003.
___________________IEEE TRANSACTIONS ON RELIABILITY
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Submitted on: 20 July 2014.
Revised on: 20 August 2014.
Accepted on: 12 October 2014.
___________________IEEE TRANSACTIONS ON RELIABILITY