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This paper has been withdrawn by the author, due an error in the proof of Proposion 2.13.
This preprint has been withdrawn. It is because I will never publish this preprint since everything has been contained in my new preprint: arXiv:0907.1506. Please refer to arXiv:0907.1506. Please do not cite this preprint any more.
This paper has been withdrawn by the author due to the gaps in the proofs of Proposition 2.2 and Proposition 3.2
This article has been withdrawn by arXiv administrators because it plagiarises arXiv:1006.4556 (published in Phys. Lett. B 693, 129 (2010)).
This paper has been withdrawn because the new one gr-qc/0512095 includes all its results (as well as those in gr-qc/0511016) in a clearer way.
This paper has been withdrawn. A significantly revised version will be posted in the near future.
This paper has been withdrawn Abstract: This paper has been withdrawn by the author due to the publication.
This paper has been withdrawn by the author(s), due to the existence of a much better paper in http://arxiv.org/abs/cs.CR/0207027
This paper has been withdrawn.
This paper has been withdrawn by the author, due to a significant error in section 4.3.1.
Withdrawn by arXiv administration because authors have forged affiliations and acknowledgements, and have not adequately responded to charges [hep-th/9912039] of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This paper has been withdrawn.
This paper has been removed by arXiv administrators because of overlap with gr-qc/9910015 and hep-th/0308070. It also has excessive overlap with the following papers also written by the authors or their collaborators: gr-qc/0509047,…
This paper has been withdrawn by the authors due to substantial changes.
Title: An unlikely result Authors: T.M. Other Comments: This paper has been withdrawn Abstract: This paper has been withdrawn by the author due to the fact that some of the results turned out to be known.
This paper has been administratively withdrawn by arXiv, duplicate of arXiv:1008.2691.
This paper has been withdrawn: it has been merged with the preprint to which it refers.
This paper has been withdrawn.
This paper has been withdrawn
This article has been replaced by arXiv:0807.3093