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This paper has been withdrawn by the author, because it is now part of an enlarged version entitled "Time functions as utilities" arXiv:0909.0890

The paper has been withdrawn by authors. The issues studied in this paper were changed so much that we have published a new paper considering these issues. See hep-th/0406074

This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This paper has been withdrawn, as it has been merged into arXiv:1009.6144

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

The paper has been withdrawn by the author, due to it being fundamentally flawed. The author apologizes for any inconvenience it may have caused.

This paper has been withdrawn as it has been superseded by 0808.2697

This paper has been withdrawn by the authors due to numerical problems to get viable results.

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn. (Reason) Its contents have been entirely superseded by the contents of the articles arXiv:0809.3444 and arXiv:0705.3070. There is no profitable reason to keep it alive. No material on it is however wrong.

This paper has been withdrawn by the author, due to a crucial error in page 5.

This paper has been withdrawn by the authors.

This paper has been withdrawn.

This paper has been withdrawn by the authors.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This paper has been withdrawn by the authors. Significantly revised versions of the results of this paper are now available in arXiv:0707.0487v2 and arXiv:0808.3169v1.

The paper is withdrawn by the authors and replaced be an improved and extended version arxiv: 0812.2968

This paper has been withdrawn by the authors

This paper has been withdrawn.

This paper has been withdrawn by the author because overcame by arXiv:0910.4694