Submitted on: 18 April 1998.
Revised on: 05 May 1998.
Accepted on: 20 May 1998.
THEORETICAL AND MATHEMATICAL PHYSICS
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Submitted on: 26 June 2000.
Revised on: 06 August 2000.
Accepted on: 19 August 2000.
THEORETICAL AND MATHEMATICAL PHYSICS
Submitted on: 18 November 2014.
Revised on: 14 December 2014.
Accepted on: 23 December 2014.
THEORETICAL AND MATHEMATICAL PHYSICS
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Submitted on: 01 September 2004.
Revised on: 15 October 2004.
Accepted on: 10 November 2004.
THEORETICAL AND MATHEMATICAL PHYSICS