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This paper has been withdrawn by the authors due to an error.

This paper has been withdrawn by the author.

This abstract has been withdrawn. The proper replacement is arXiv:0909.3306

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This paper has been withdrawn at the author's request.

This paper has been withdrawn by the author.

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A modified version of this paper is under process and with a new title and abstract. Hence, this version of the article is completely withdrawn.

This paper has been withdrawn by the author due to an error in the proof.

This paper has been removed by arXiv administrators because it plagiarizes gr-qc/0011027, gr-qc/0205028, and gr-qc/0303034.

This paper has been withdrawn.

Erroneous submission in violation of copyright removed by arXiv admin.

This paper has been withdrawn by the author: it was a too preliminary version.

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This paper has been withdrawn due to a copyright restrictions.

The paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn because of serious errors.

The paper is taken out.

This manuscript has been withdrawn at 17 April, 2007.