Submitted on: 10 January 1998.
Revised on: 07 April 1998.
Accepted on: 21 May 1998.
___________________Journal of Measurements in Engineering
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Submitted on: 25 November 1999.
Revised on: 19 January 2000.
Accepted on: 06 February 2000.
___________________Journal of Measurements in Engineering
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Submitted on: 10 June 2002.
Revised on: 27 July 2002.
Accepted on: 16 August 2002.
___________________Journal of Measurements in Engineering