Submitted on: 16 December 2012.
Revised on: 25 February 2013.
Accepted on: 18 April 2013.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
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Submitted on: 13 March 2004.
Revised on: 05 April 2004.
Accepted on: 02 June 2004.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
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Submitted on: 01 May 2013.
Revised on: 28 July 2013.
Accepted on: 16 August 2013.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
Submitted on: 17 September 1998.
Revised on: 26 December 1998.
Accepted on: 02 February 1999.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
Submitted on: 11 May 2011.
Revised on: 18 June 2011.
Accepted on: 12 July 2011.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
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Submitted on: 05 January 2007.
Revised on: 16 April 2007.
Accepted on: 30 May 2007.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS