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This paper has been withdrawn by the author(s), due to double submission. You can find it under: physics/0208019

This paper has been withdrawn by the author because it needs a deep methodological revision.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.

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This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

This paper has been removed by arXiv administrators because it overlaps hep-th/0308070, and others. This paper also has excessive overlap with the following paper also written by the authors or their collaborators: gr-qc/0506061.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a gap in the proof of the main result.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

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This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn by the author: it was a too preliminary version.

This paper has been withdrawn by the author due to a errors in figure 3,4

This paper has been withdrawn by the authors. Because of a misunderstanding, the paper was submitted prematurely to the arXiv. A replacement will follow.

This paper has been withdrawn by the authour.

The paper was withdrawn by the authors

This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).