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This paper has been withdrawn because of the requirement from the journal where the modified version of the paper is to be published.

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This paper has been withdrawn by the author due to an error in the last paragraph of step 2 of the main proof, on page 6.

This paper has been withdrawn by the authors after discussing its content with Dr. J. Madsen.

This paper has been withdrawn by the author(s), due a crucial sign error in conclusion .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This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

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This paper has been withdrawn by the author due to a new work in [arXiv:0901.0456v4] which can contain the results in this paper.

This paper has been withdrawn by the author due to a crucial argument error at p.10.

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This paper has been withdrawn by arXiv administrators because of disputed claims of authorship among former collaborators

This paper has been withdrawn by the author, due to a significant error in section 4.3.1.