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Submitted on: 10 April 2009.
Revised on: 09 July 2009.
Accepted on: 03 September 2009.
___________________International Journal of Prognostics and Health Management
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Submitted on: 06 May 2000.
Revised on: 21 August 2000.
Accepted on: 18 September 2000.
___________________International Journal of Prognostics and Health Management
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