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Withdrawn due to extensions and submission as another paper.
This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.
This paper has been withdrawn at the author's request.
This paper has been withdrawn by the author due to an extended and largely modified version of the paper was published in arXiv (see arXiv:0807.3694, Disjoint minimal graphs).
The paper has been withdrawn by the author, due to it being fundamentally flawed. The author apologizes for any inconvenience it may have caused.
This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.
This paper has been withdrawn by the authors due to some fatal errors in the analysis.
This paper has been withdrawn by the authors as they feel it inappropriate to publish this paper for the time being.
This paper has been withdrawn by the author due to a gap in the proof of the main result.
This paper was withdrawn by arXiv admin due to authors' misrepresentation of identity/affiliation.
This paper has been withdrawn.
This paper has been withdrawn.
This paper has been withdrawn by the author due to a crucial error.
This paper has been withdrawn by the author due to the incorrect argument for the security.
This paper has been retracted.
This paper has been withdrawn by the author: it was a too preliminary version.
This paper has been withdraw by the author due to adding more modeling results.
This paper has been withdrawn by the author: it was a too preliminary version.
This paper has been withdrawn by the author, due to an error in Proposition 2.2.
The paper was withdrawn because of its significant overlap with a paper appeared recently.