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Submitted on: 11 March 1999.
Revised on: 23 May 1999.
Accepted on: 17 June 1999.
___________________JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
Submitted on: 18 June 2003.
Revised on: 12 September 2003.
Accepted on: 04 November 2003.
___________________JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
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