November 23, 2001
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June 22, 1999
This paper has been withdrawn by the author due to inconsistency of the considered working hypothesis. The consistent treatment is presented in the last publications of the author.
July 22, 1998
This paper has been withdrawn due to crucial errors.
August 18, 2009
This paper has been withdrawn by the author(s), due a mistake of factor 1/2.
March 29, 1997
This paper has been withdrawn.
July 26, 2005
This paper has been withdrawn
January 30, 1998
This paper has been withdrawn due to crucial erros in equations (24)--(31).
November 5, 2007
This paper has been withdrawn by the author due to a crucial sign error in equation 1.
November 29, 2002
This paper has been withdrawn.
September 21, 2001
This paper was withdrawn. It has been superseded by the latest version of hep-th/0107069.
June 28, 1999
This paper has been withdrawn by the author. It has come to my attention that most of the results reported here have already been obtained by Ludvigsen.