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Submitted on: 03 January 2013.
Revised on: 26 February 2013.
Accepted on: 20 April 2013.
___________________COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS
Submitted on: 24 March 1998.
Revised on: 25 May 1998.
Accepted on: 25 June 1998.
___________________COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS
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Submitted on: 29 December 2014.
Revised on: 21 February 2015.
Accepted on: 02 April 2015.
___________________COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS