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This paper has been withdrawn by the authors. This is due to the fact that it has been substantially revised. As a consequence title and aim of the contents

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

The paper has been withdrawn due to numerical error.

The paper has been withdrawn.

This paper has been withdrawn.

The paper was withdrawn by the author. Further research is needed.

This paper has been withdrawn. A significantly revised version will be posted in the near future.

This paper is being withdrawn by the authors in order to correct some errors and also to introduce improved theoretical techniques.

This paper has been withdrawn by the authors.

This paper has been withdrawn.

This paper has been withdrawn by the authors to avoid redundancy with e-print hep-ph0507031.

This paper has been withdrawn by author.

The original version of this paper has been withdrawn by the authors and merged with the revised version of astro-ph/9702014.

unpublished; this paper has been withdrawn.

This paper has been withdrawn by the authors, due to a mistake pointed out by Lenny Ng and Josh Sabloff.

This paper has been withdrawn.

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This paper has been withdrawn by the author due to errors.

This paper has been withdrawn by the authors due to lack of significant consideration.