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Until we can more carefully assess the validity of the physical assumptions made we withdraw this paper.

This paper has been withdrawn to address an omission. It will be resubmitted in the near future.

This paper has been withdrawn by the author due to an error

This paper has been withdrawn by the authors. The authors have now written two separate papers, one theoretical (A. Smerzi, A. Trombettoni, P. G. Kevrekidis, and A. R. Bishop Phys. Rev. Lett. 89, 170402 (2002)) and one experimental (F. S.…

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors, since the reference citation were not appropriately arranged.

This paper has been withdrawn by the authors; its contents are superseded by that of hep-th/0105305 and hep-th/0212275.

This paper has been withdrawn due to its publication

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to errors.

This paper has been withdrawn by the authors.

This paper has been withdrawn, because relevant publications, related to the subject of the paper, were overlooked by the author.

This paper has been withdrawn by the author.

This paper is incorrect, and has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the author due to the incomplete results.

This paper was withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn.