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Submitted on: 02 June 2007.
Revised on: 04 July 2007.
Accepted on: 20 July 2007.
___________________CONTROL ENGINEERING PRACTICE---PERGAMON-ELSEVIER SCIENCE LTD
Submitted on: 19 June 2012.
Revised on: 18 August 2012.
Accepted on: 30 September 2012.
___________________CONTROL ENGINEERING PRACTICE---PERGAMON-ELSEVIER SCIENCE LTD
Submitted on: 22 March 1999.
Revised on: 26 May 1999.
Accepted on: 10 July 1999.
___________________CONTROL ENGINEERING PRACTICE---PERGAMON-ELSEVIER SCIENCE LTD
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