Related papers: Global Minimization of Rational Functions and the …

This paper has been withdrawn by the author due to essential mistakes in some previous versions.

This paper has been withdrawn by the author due to some mistakes

This paper has been withdrawn.

This paper has been withdrawn by the authors pending corrections.

This paper has been withdrawn

This paper was withdrawn by the author.

The author has removed this paper, following the publication of a more complete version.

This paper has been withdrawn by the author due to an error

This paper has been withdrawn by the authour.

This paper has been withdrawn by the author due to an error in the proof of Proposition 4.8.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper was withdrawn by the authors.

This paper has been withdrawn because of serious errors.

This paper has been withdrawn by the authors due to a crucial error in equation 12.

This paper has been withdrawn by the author(s) in the light of several other works available and due to a misunderstanding in the authorships.

This paper was withdrawn by the authors due to significant new findings. A new paper on the same topic has been submitted as physics/0310159.

This paper has been withdrawn by the author.

The paper was removed.

This paper has been withdrawn by the authors due to some technical problems in the paper.