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Submitted on: 24 November 2008.
Revised on: 28 January 2009.
Accepted on: 17 February 2009.
___________________JOURNAL OF QUALITY TECHNOLOGY---TAYLOR & FRANCIS INC
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Submitted on: 21 August 2004.
Revised on: 15 October 2004.
Accepted on: 26 November 2004.
___________________JOURNAL OF QUALITY TECHNOLOGY---TAYLOR & FRANCIS INC