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Submitted on: 17 June 2007.
Revised on: 10 July 2007.
Accepted on: 20 July 2007.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
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Submitted on: 30 November 2004.
Revised on: 29 December 2004.
Accepted on: 20 January 2005.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
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Submitted on: 16 September 2009.
Revised on: 18 October 2009.
Accepted on: 01 November 2009.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS