Submitted on: 21 June 2001.
Revised on: 22 July 2001.
Accepted on: 14 September 2001.
___________________IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY
Submitted on: 29 December 2003.
Revised on: 09 March 2004.
Accepted on: 05 April 2004.
___________________IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY
Submitted on: 07 May 1999.
Revised on: 01 June 1999.
Accepted on: 12 July 1999.
___________________IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY
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