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Submitted on: 28 March 2011.
Revised on: 26 April 2011.
Accepted on: 05 May 2011.
THEORETICAL AND MATHEMATICAL PHYSICS
Submitted on: 29 April 2001.
Revised on: 15 May 2001.
Accepted on: 30 May 2001.
THEORETICAL AND MATHEMATICAL PHYSICS
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Submitted on: 04 February 2019.
Revised on: 02 March 2019.
Accepted on: 27 March 2019.
THEORETICAL AND MATHEMATICAL PHYSICS
Submitted on: 18 May 2007.
Revised on: 15 June 2007.
Accepted on: 26 June 2007.
THEORETICAL AND MATHEMATICAL PHYSICS
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Submitted on: 13 December 2009.
Revised on: 17 January 2010.
Accepted on: 13 February 2010.
THEORETICAL AND MATHEMATICAL PHYSICS
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