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Submitted on: 01 May 2005.
Revised on: 06 August 2005.
Accepted on: 01 September 2005.
___________________Journal of Physics A-Mathematical and Theoretical
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Submitted on: 02 November 2016.
Revised on: 25 February 2017.
Accepted on: 22 April 2017.
___________________Journal of Physics A-Mathematical and Theoretical
Submitted on: 17 January 2015.
Revised on: 03 March 2015.
Accepted on: 31 March 2015.
___________________Journal of Physics A-Mathematical and Theoretical
Submitted on: 29 September 2006.
Revised on: 17 November 2006.
Accepted on: 23 December 2006.
___________________Journal of Physics A-Mathematical and Theoretical
Submitted on: 28 April 1999.
Revised on: 02 August 1999.
Accepted on: 22 August 1999.
___________________Journal of Physics A-Mathematical and Theoretical
Submitted on: 10 February 2012.
Revised on: 10 May 2012.
Accepted on: 22 May 2012.
___________________Journal of Physics A-Mathematical and Theoretical
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