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Submitted on: 17 February 2007.
Revised on: 12 April 2007.
Accepted on: 27 April 2007.
___________________International Journal of Computational Methods
Submitted on: 17 October 2002.
Revised on: 16 November 2002.
Accepted on: 04 January 2003.
___________________International Journal of Computational Methods
Submitted on: 26 July 2016.
Revised on: 18 November 2016.
Accepted on: 02 January 2017.
___________________International Journal of Computational Methods
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