Submitted on: 06 June 2004.
Revised on: 19 September 2004.
Accepted on: 21 October 2004.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
Submitted on: 05 September 2007.
Revised on: 27 October 2007.
Accepted on: 05 December 2007.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
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Submitted on: 11 October 2013.
Revised on: 22 December 2013.
Accepted on: 06 January 2014.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
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