相关论文: On cocycle actions of non-commutative Bernoulli sh…
This paper has been withdrawn since we combine this paper with math.AC/0503685. All contents of the paper have been moved to math.AC/0503685.
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This paper has been withdrawn by the authors. It has been superseded by hep-th/0309154
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This paper has been withdrawn by the author due to the appearence of enlarged version with one new author name more (hep-ph/0012293).
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