Related papers: Brauer groups and Tate-Shafarevich groups, II

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This paper was withdrawn by the authors.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

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This paper has been withdrawn by the author, since it is now a part of "Classical aspects of lightlike dimensional reduction" Class.Quant.Grav.23:7085-7110, 2006, gr-qc/0610011

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