Submitted on: 17 September 2018.
Revised on: 27 December 2018.
Accepted on: 19 February 2019.
___________________Journal of Applied Mathematics & Informatics
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Submitted on: 27 April 2001.
Revised on: 29 July 2001.
Accepted on: 12 August 2001.
___________________Journal of Applied Mathematics & Informatics
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Submitted on: 01 June 2007.
Revised on: 11 September 2007.
Accepted on: 27 September 2007.
___________________Journal of Applied Mathematics & Informatics
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Submitted on: 16 March 2002.
Revised on: 16 April 2002.
Accepted on: 27 April 2002.
___________________Journal of Applied Mathematics & Informatics
Submitted on: 19 March 2015.
Revised on: 15 May 2015.
Accepted on: 28 May 2015.
___________________Journal of Applied Mathematics & Informatics
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