Submitted on: 17 April 2011.
Revised on: 22 May 2011.
Accepted on: 04 July 2011.
___________________Communications in Number Theory and Physics
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Submitted on: 15 December 2005.
Revised on: 21 March 2006.
Accepted on: 30 April 2006.
___________________Communications in Number Theory and Physics
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Submitted on: 30 April 1999.
Revised on: 20 June 1999.
Accepted on: 26 July 1999.
___________________Communications in Number Theory and Physics
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Submitted on: 07 May 2020.
Revised on: 22 June 2020.
Accepted on: 02 August 2020.
___________________Communications in Number Theory and Physics
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