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This paper has been withdrawn by the author and it is published in AGAG

The paper has been withdrawn by the authors

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors.

This paper has been withdrawn since it was an inadvertant double submission. An updated version of the original submission can be found at quant-ph/0505131

This paper has been withdrawn by the authors.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This paper has been withdrawn by the author, since most of the results have been published before.

This paper has been withdrawn by the authors, because of serious experimental problems.

This paper has been withdrawn by the author due to new results to be added.

This paper has been withdrawn by the author due to the gaps in the proofs of Proposition 2.2 and Proposition 3.2

This paper has been withdrawn by the authors. We are in the process of obtaining more data and will resubmit a modified manuscript in the near future.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author, due to a significant error in section 4.3.1.

This article has been withdrawn.

This paper has been withdrawn.

This paper is being withdrawn by the author due a serious flaw.

This paper has been withdrawn.

The paper has been withdrawn

This paper has been withdrawn. The authors realized that the obtained results were not new.