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Submitted on: 18 February 2007.
Revised on: 07 April 2007.
Accepted on: 20 April 2007.
___________________International Journal of Applied Mathematics and Computer Science
Submitted on: 07 July 2021.
Revised on: 18 September 2021.
Accepted on: 14 October 2021.
___________________International Journal of Applied Mathematics and Computer Science
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Submitted on: 22 July 2003.
Revised on: 30 October 2003.
Accepted on: 28 December 2003.
___________________International Journal of Applied Mathematics and Computer Science
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Submitted on: 13 November 1999.
Revised on: 05 February 2000.
Accepted on: 11 March 2000.
___________________International Journal of Applied Mathematics and Computer Science