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This paper has been withdrawn by the authors until some changes are made.

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This paper has been withdrawn, because it is subsumed by the new preprint arXiv:0806.4540 .

This paper was withdrawn by the authors. The mistake in math.AG/0209223 affects also this paper.

This paper has been withdrawn by the author due to an error in the proof.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to the incorrect application of the divergence theorem to Eqs 7, 8 and 9.

This paper has been withdrawn by the authors, due a crucial error in Sec. 3.

This paper has been retracted.

This paper has been withdrawn by the authors, because of serious experimental problems.

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the author

This paper has been temporarily withdrawn by the authors.

The paper has been withdrawn by the authors

This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the author. The conjecture follows from the finiteness of group von Neumann algebras.

The paper has been withdrawn by the author.

The paper has been withdrawn.

This paper is removed from the network permanently. The content in this paper has now been put together with hep-th/9310183. See the recently replaced and widely revised version of the latter.