Submitted on: 25 April 2019.
Revised on: 03 June 2019.
Accepted on: 14 June 2019.
___________________International Journal of Applied Mathematics and Computer Science
Submitted on: 17 December 2005.
Revised on: 13 April 2006.
Accepted on: 03 May 2006.
___________________International Journal of Applied Mathematics and Computer Science
Submitted on: 13 April 2009.
Revised on: 29 June 2009.
Accepted on: 26 August 2009.
___________________International Journal of Applied Mathematics and Computer Science
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Submitted on: 07 March 2014.
Revised on: 19 May 2014.
Accepted on: 17 June 2014.
___________________International Journal of Applied Mathematics and Computer Science
Submitted on: 03 January 2013.
Revised on: 14 February 2013.
Accepted on: 05 April 2013.
___________________International Journal of Applied Mathematics and Computer Science
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