Submitted on: 24 June 1998.
Revised on: 12 September 1998.
Accepted on: 28 October 1998.
___________________JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
Submitted on: 26 March 2013.
Revised on: 16 May 2013.
Accepted on: 02 June 2013.
___________________JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
Submitted on: 04 July 2006.
Revised on: 07 October 2006.
Accepted on: 26 November 2006.
___________________JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
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Submitted on: 23 January 2003.
Revised on: 05 May 2003.
Accepted on: 01 June 2003.
___________________JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
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Submitted on: 02 November 2007.
Revised on: 08 February 2008.
Accepted on: 13 March 2008.
___________________JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS