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This paper was withdrawn by the authors. The mistake in math.AG/0209223 affects also this paper.

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This paper has been withdrawn by the author(s), due a crucial sign error in Thm. 11.

This paper has been withdrawn by the author due to an erro thereon line -2 of page 4.

This submission has been withdrawn by arXiv admins due to fraudulent affiliation claims by the original submitter.

This paper has been withdrawn by the author because there are some typos in proofs.

This paper has been withdrawn.

This paper has been withdrawn by author due to an error in the proof.

This paper has been withdrawn

The paper was withdrawn because of its significant overlap with a paper appeared recently.

This paper has been removed by arXiv administrators because of excessive overlap with gr-qc/0506062.

Withdrawn by arXiv administration because authors have forged affiliations and acknowledgements, and have not adequately responded to charges [hep-th/9912039] of unattributed use of verbatim material.

This paper has been withdrawn by the author due to a gap in the proof of Lemma 3.4

This paper has been withdrawn by the first author due to incomplete bibliography and incorporation of multiple formats in the same file.

This paper was withdrawn by the authors.

Although the results are correct, it was pointed out that the results follow from some previously known results. Accordingly, this version of the paper is withdrawn by the authors.

This paper was withdrawn by the authors.

Admin note: withdrawn by arXiv admin because of the use of a pseudonym, in violation of arXiv policy.