Submitted on: 19 January 2013.
Revised on: 18 February 2013.
Accepted on: 24 March 2013.
___________________International Journal of Quality & Reliability Management
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Submitted on: 23 August 2000.
Revised on: 14 September 2000.
Accepted on: 12 October 2000.
___________________International Journal of Quality & Reliability Management
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