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This paper has been withdraw by the authors. An enlarged and complete analysis of the constraints is presented in hep-th/9910163. It includes also relativistic particles and strings. The non-relativistic particle quantization has been…

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This paper has been withdrawn by the author because overcame by arXiv:0910.4694

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This paper has been withdrawn by the author due to journal requirement.

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This paper has been withdrawn by the authors until some changes are made.

This paper has been withdrawn at the author's request.

The paper is withdrawn by the authors and replaced be an improved and extended version arxiv: 0812.2968

This paper has been withdrawn by the authors.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This paper has been withdrawn due to disagreement of suggested results and methods between authors.

This paper has been withdrawn by the author due to errors.

This paper has been withdrawn by the author because similar published work on the topic was overlooked. See S. Deser and A. Waldron, Nucl. Phys. B 631, 369-387 (2002).

The paper was withdrawn by the author. Further research is needed.

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This paper has been withdrawn by the author and replaced by arXiv:0809.4751