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Submitted on: 28 July 2004.
Revised on: 20 September 2004.
Accepted on: 14 November 2004.
___________________Journal of Computational Methods in Sciences and Engineering
Submitted on: 13 September 2005.
Revised on: 19 December 2005.
Accepted on: 28 January 2006.
___________________Journal of Computational Methods in Sciences and Engineering
Submitted on: 18 July 2013.
Revised on: 19 September 2013.
Accepted on: 25 October 2013.
___________________Journal of Computational Methods in Sciences and Engineering
Submitted on: 22 February 2008.
Revised on: 10 June 2008.
Accepted on: 18 July 2008.
___________________Journal of Computational Methods in Sciences and Engineering
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Submitted on: 20 April 2014.
Revised on: 25 June 2014.
Accepted on: 21 August 2014.
___________________Journal of Computational Methods in Sciences and Engineering