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This paper has been withdrawn by the author due to the result being known

This paper has been withdrawn, since it contains a corollary with impossible consequences and the source of an error is currently unknown.

The paper has been withdrawn by the author.

This paper has been withdrawn by the author

The paper has been withdrawn by authors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to the unsure solutions to the Dyson-Schwinger equation.

This paper has been withdrawn by the author.

This paper has been withdrawn.

The paper has been withdrawn

This paper has been withdrawn by the author [arXiv admin].

The paper was withdrawn by the authors.

This paper has been withdrawn because the new one gr-qc/0512095 includes all its results (as well as those in gr-qc/0507018), in a clearer way.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to the unsuitable content.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author, because a better treatment is given in the author's Phd. thesis (Sections 3.4.6 and 4.4), now available on the arxiv.

The paper is withdrawn by the authors and replaced be an improved and extended version arxiv: 0812.2968

This paper has been withdrawn by the author.

The paper has been withdrawn