Submitted on: 19 October 2014.
Revised on: 14 February 2015.
Accepted on: 08 April 2015.
___________________Advances in Pure and Applied Mathematics
Submitted on: 04 January 2016.
Revised on: 20 March 2016.
Accepted on: 20 April 2016.
___________________Advances in Pure and Applied Mathematics
Submitted on: 25 April 2006.
Revised on: 11 June 2006.
Accepted on: 29 July 2006.
___________________Advances in Pure and Applied Mathematics
Submitted on: 18 October 2001.
Revised on: 01 February 2002.
Accepted on: 31 March 2002.
___________________Advances in Pure and Applied Mathematics
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Submitted on: 19 April 2022.
Revised on: 15 May 2022.
Accepted on: 02 July 2022.
___________________Advances in Pure and Applied Mathematics
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Submitted on: 02 September 2018.
Revised on: 04 October 2018.
Accepted on: 06 November 2018.
___________________Advances in Pure and Applied Mathematics
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