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Submitted on: 20 September 1998.
Revised on: 31 October 1998.
Accepted on: 14 December 1998.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
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Submitted on: 04 January 2011.
Revised on: 31 January 2011.
Accepted on: 14 March 2011.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
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Submitted on: 22 September 2001.
Revised on: 17 January 2002.
Accepted on: 27 February 2002.
___________________JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
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