Submitted on: 29 October 2012.
Revised on: 01 December 2012.
Accepted on: 08 December 2012.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
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Submitted on: 14 January 2012.
Revised on: 06 February 2012.
Accepted on: 21 February 2012.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
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Submitted on: 21 February 2001.
Revised on: 13 March 2001.
Accepted on: 04 April 2001.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
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Submitted on: 15 September 2003.
Revised on: 24 September 2003.
Accepted on: 10 October 2003.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
Submitted on: 09 March 2001.
Revised on: 10 April 2001.
Accepted on: 07 May 2001.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS