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Submitted on: 07 November 1999.
Revised on: 01 March 2000.
Accepted on: 22 April 2000.
___________________JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
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Submitted on: 07 August 2008.
Revised on: 14 November 2008.
Accepted on: 04 January 2009.
___________________JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS