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Submitted on: 10 August 2004.
Revised on: 29 October 2004.
Accepted on: 26 November 2004.
___________________Communications in Number Theory and Physics
Submitted on: 16 July 2022.
Revised on: 14 September 2022.
Accepted on: 23 October 2022.
___________________Communications in Number Theory and Physics
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Submitted on: 13 September 2013.
Revised on: 18 December 2013.
Accepted on: 08 February 2014.
___________________Communications in Number Theory and Physics
Submitted on: 27 February 2001.
Revised on: 25 May 2001.
Accepted on: 26 June 2001.
___________________Communications in Number Theory and Physics
Submitted on: 24 July 1998.
Revised on: 18 September 1998.
Accepted on: 15 October 1998.
___________________Communications in Number Theory and Physics
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