Submitted on: 12 July 2002.
Revised on: 26 August 2002.
Accepted on: 15 October 2002.
___________________INSTRUMENTS AND EXPERIMENTAL TECHNIQUES
Submitted on: 20 April 2006.
Revised on: 20 May 2006.
Accepted on: 07 July 2006.
___________________INSTRUMENTS AND EXPERIMENTAL TECHNIQUES
Submitted on: 03 May 2000.
Revised on: 12 August 2000.
Accepted on: 19 September 2000.
___________________INSTRUMENTS AND EXPERIMENTAL TECHNIQUES
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