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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

The paper has been withdrawn

This paper has been withdrawn by the author. The paper has been accepted for publication in Communications on Pure and Applied Mathematics.

This paper has been withdrawn by the authors, due a oversimplified decoherence model. It will be substituted by a new work.

This paper has been withdrawn by the author.

This paper was withdrawn by the authors due to the belated discovery of a published paper showing similar results.

The paper has been withdrawn.

This paper has been withdrawn by the author. This paper is now obsolete. For a solution please see: arXiv:/1205.4265.

This paper has been withdrawn

This paper has been withdrawn by the author due to the paper does not belong to Condensed Matter field.

This paper has been withdrawn by the author, due a crucial mistake in proof of lemma 4.2.

This paper has been withdrawn by the author(s). The material contained in the paper will be published in a subtantially reorganized form, part of it is now included in math.QA/0510174

The paper has been withdrawn

This submission has been withdrawn at the request of the author.

The paper has been withdrawn because the research work is still in progress.

This paper was withdrawn by the author.

There have been gaps found in the proofs. The paper is withdrawn until further notice.

The paper has been withdrawn by authors.

This paper has been withdrawn by the authors, due Eqn. 8 is not a corollary of ref. 3 and does not hold generally.

This paper has been withdrawn.