Related papers: Global Minimization of Rational Functions and the …

This paper has been withdrawn by the author(s),

This paper has been withdrawn by the author due to the unsure solution to the Dyson-Schwinger equation.

The paper was withdrawn by the author. It contained various errors.

This paper has been withdrawn by the author.

The paper has been withdrawn by the authors

This paper has been withdrawn by the author.

The paper has been withdrawn by the authors.

This paper has been withdrawn by authors for significant modification.

This paper has been withdrawn by the authors due to need of essential revision.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to similarity to the author's other paper

This paper has been withdrawn.

None. This paper has been withdrawn by the authors.

This paper has been withdrawn since the results are not satisfied.

This paper has been withdrawn.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors because the paper is largely revised and improved.

This paper has been withdrawn.

This paper has been withdrawn by the author due to an error in the derivation.