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Major mistake. The paper has been withdrawn.

This paper has been withdrawn by the author due to some mistakes

This paper is withdrawn by the authors.

This paper has been withdrawn by the authors, due to issues concerning the use of unpublished experimental data.

This paper has been withdrawn by the author. A much more revised version is available as arXiv:0909.4238.

This paper has been withdrawn by the authors due to new experimental results.

The paper is withdrawn.

%auto-ignore This paper has been withdrawn by the authors.

The paper has been withdrawn by the authors

This paper has been withdrawn by the author, due to a crucial error in the proof of Thm.1

This paper has been withdrawn by the author

This paper has been withdrawn by the author, because a better treatment is given in the author's Phd. thesis (Sections 3.4.6 and 4.4), now available on the arxiv.

This paper has been withdrawn by the author due to the incorrect argument for the security.

This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn due to disagreement of suggested results and methods between authors.

This paper has being withdrawn by the authors due to an error in the conclusion.

This paper has been withdrawn by the author due to a mistake in the proof of the main theorem.

This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.