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Submitted on: 06 October 2016.
Revised on: 07 December 2016.
Accepted on: 06 January 2017.
___________________Applied Mathematics in Science and Engineering
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Submitted on: 19 August 2016.
Revised on: 30 September 2016.
Accepted on: 27 October 2016.
___________________Applied Mathematics in Science and Engineering
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Submitted on: 23 October 2011.
Revised on: 09 January 2012.
Accepted on: 02 March 2012.
___________________Applied Mathematics in Science and Engineering
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Submitted on: 26 March 2001.
Revised on: 26 June 2001.
Accepted on: 22 July 2001.
___________________Applied Mathematics in Science and Engineering
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