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This paper has been withdrawn by the authors due to the paper is far from complishment.

This paper has been withdrawn by the author.

The paper has been withdrawn by the author due to a crucial error.

The paper was withdrawn by the author. Further research is needed.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author. A revised and expanded version is gr-qc/9907028 (Phys.Rev. D60 (1999) 104043).

This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

This paper has been withdrawn by the author due to a crucial sign error in equation 1.

This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This paper has been withdrawn by the author due to the unsure solutions to the Dyson-Schwinger equation.

This paper has been withdrawn by the author due to imprecisions which must conduce to wrong results.

This paper has been withdrawn by the authors due to some technical problems in the paper.

This paper has been withdrawn by the author because of copyright reasons.

This paper has been withdrawn by the author, due to an error in relation (11).

This paper has been withdrawn by the author due to some problems.

This paper has been withdrawn by the author due to a crucial sign error in equation 1.

This paper has been withdrawn by the author due to a crucial error in several equations.