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Submitted on: 15 December 2011.
Revised on: 04 March 2012.
Accepted on: 15 April 2012.
___________________Applications and Applied Mathematics-An International Journal
Submitted on: 05 November 2015.
Revised on: 13 February 2016.
Accepted on: 16 March 2016.
___________________Applications and Applied Mathematics-An International Journal
Submitted on: 27 October 2013.
Revised on: 15 February 2014.
Accepted on: 12 March 2014.
___________________Applications and Applied Mathematics-An International Journal
Submitted on: 17 January 2019.
Revised on: 15 May 2019.
Accepted on: 05 July 2019.
___________________Applications and Applied Mathematics-An International Journal
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Submitted on: 05 November 2014.
Revised on: 09 January 2015.
Accepted on: 07 February 2015.
___________________Applications and Applied Mathematics-An International Journal
Submitted on: 19 April 2011.
Revised on: 14 June 2011.
Accepted on: 18 July 2011.
___________________Applications and Applied Mathematics-An International Journal
Submitted on: 13 March 2016.
Revised on: 19 June 2016.
Accepted on: 08 August 2016.
___________________Applications and Applied Mathematics-An International Journal