Related papers: Spectral functions in mathematics and physics

The contents of this manuscript has been moved to hep-ph/0412204.

This paper has been withdrawn by the author due to a crucial error in the proof of Lemma 2.2.

This submission has been withdrawn by the authors because it is a duplicate of arXiv:hep-ph/0611336. It was due to a technical submission error by the authors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author

This paper has been withdrawn by the author(s). Please refer to quant-ph/0311171.

This paper has been withdrawn.

This paper has been withdrawn by the author and replaced by arXiv:0809.4751

This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn to allow publication elsewhere.

This paper has been withdrawn.

This has been withdrawn by the authors.

The paper has been withdrawn by the authors. See newer and expanded version quant-ph/0606221, published in Europhysics Letters 78, 30004 (2007).

The author has withdrawn this submission.

This paper has been withdrawn by the author. A revised and expanded version is gr-qc/9907028 (Phys.Rev. D60 (1999) 104043).

This paper has been withdrawn by the author because the arguments presented in the paper is incomplete.

This paper has been withdrawn by the authors due to an unlikely results.