Related papers: Category O over skew group rings

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This paper has been withdrawn by the author(s), due a crucial sign error in conclusion .

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This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

This paper has been withdrawn by the author due to serious flaws in certain proofs. For instance, the method used to construct certain automorphic representations is flawed.

This paper has been withdrawn by the author due to a gap in the proof of the main result.

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This paper has been withdrawn by the author(s) in the light of several other works available and due to a misunderstanding in the authorships.

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This paper has been withdrawn by the author. A revised and expanded version is gr-qc/9907028 (Phys.Rev. D60 (1999) 104043).

This paper has been withdrawn by the author due to a new work in [arXiv:0901.0456v4] which can contain the results in this paper.

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