Submitted on: 18 June 2009.
Revised on: 17 August 2009.
Accepted on: 27 August 2009.
___________________JOURNAL OF PROCESS CONTROL---ELSEVIER SCI LTD
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Submitted on: 03 March 1998.
Revised on: 09 May 1998.
Accepted on: 30 May 1998.
___________________JOURNAL OF PROCESS CONTROL---ELSEVIER SCI LTD
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