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Submitted on: 18 December 2009.
Revised on: 10 April 2010.
Accepted on: 27 April 2010.
___________________JOURNAL OF PROCESS CONTROL---ELSEVIER SCI LTD
Submitted on: 06 April 2007.
Revised on: 01 August 2007.
Accepted on: 11 September 2007.
___________________JOURNAL OF PROCESS CONTROL---ELSEVIER SCI LTD
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