Submitted on: 21 April 2000.
Revised on: 26 May 2000.
Accepted on: 07 June 2000.
THEORETICAL AND MATHEMATICAL PHYSICS
Submitted on: 06 January 2002.
Revised on: 13 February 2002.
Accepted on: 25 February 2002.
THEORETICAL AND MATHEMATICAL PHYSICS
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Submitted on: 14 July 2023.
Revised on: 21 August 2023.
Accepted on: 02 September 2023.
THEORETICAL AND MATHEMATICAL PHYSICS
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Submitted on: 03 February 2016.
Revised on: 16 February 2016.
Accepted on: 25 February 2016.
THEORETICAL AND MATHEMATICAL PHYSICS
Submitted on: 17 February 1999.
Revised on: 28 February 1999.
Accepted on: 25 March 1999.
THEORETICAL AND MATHEMATICAL PHYSICS
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