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Submitted on: 21 April 2008.
Revised on: 14 June 2008.
Accepted on: 27 June 2008.
___________________INSTRUMENTATION SCIENCE & TECHNOLOGY
Submitted on: 22 November 2003.
Revised on: 26 January 2004.
Accepted on: 03 March 2004.
___________________INSTRUMENTATION SCIENCE & TECHNOLOGY
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