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Submitted on: 28 January 2000.
Revised on: 01 March 2000.
Accepted on: 02 April 2000.
___________________International Journal of Mathematical Engineering and Management Sciences
Submitted on: 28 February 2015.
Revised on: 16 April 2015.
Accepted on: 24 May 2015.
___________________International Journal of Mathematical Engineering and Management Sciences
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Submitted on: 06 July 1998.
Revised on: 02 September 1998.
Accepted on: 19 October 1998.
___________________International Journal of Mathematical Engineering and Management Sciences
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Submitted on: 27 January 2006.
Revised on: 13 May 2006.
Accepted on: 05 June 2006.
___________________International Journal of Mathematical Engineering and Management Sciences
Submitted on: 08 September 2005.
Revised on: 14 November 2005.
Accepted on: 31 December 2005.
___________________International Journal of Mathematical Engineering and Management Sciences
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