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This paper has been withdrawn by the author as a major revision is made and a new version is uploaded at arXiv:0812.3120
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This paper has been withdrawn by the author.
The paper was withdrawn by the author. Further research is needed.
This article was withdrawn because (1) it was uploaded without the co-authors' knowledge or consent, and (2) there are allegations of plagiarism.
This paper has been withdrawn because of the requirement from the journal where the modified version of the paper is to be published.
This paper has been withdrawn by the author(s) for revision.
This paper has been withdrawn by the author, since most of the results have been published before.
This paper has been withdrawn by the authors. A substantially altered paper will be submitted incorporating major corrections, additions and improvements.
This paper has been withdrawn because the models on which it was based have undergone significant changes and improvements. A new paper with the same title, based on the improved models, is accepted for publication in MNRAS and is available…
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This paper has been withdrawn by the author due to some incorrect presentation in the results and discussion part.
This paper has been withdrawn by the authors, because of serious experimental problems.
This paper has been withdrawn by the author due to a crucial sign error in equation 1
This paper has been withdrawn by the author(s), due the following reasons. A similar system for a different purpose has already been studied in Phys.Rev.D60:083001,1999 (astro-ph/9904315). Moreover, our analysis was wrong because we have…
This paper has been withdrawn by the author(s), due the final version in math.QA/0604564
This paper has been withdrawn by the author because there are some typos in proofs.
This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.