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This paper has been withdrawn by the authors, due an error involving the weak* convergence argument in section 2

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This paper has been withdrawn due to a crucial theoretical error.

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This paper has been withdrawn by the author due to incomplete interpretation for the results.

This paper has been withdrawn by the author.

This paper has been withdrawn due to errors in the analysis of data with Carrier Access Rate control and statistical methodologies.

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This paper has been withdrawn by the authors.

This paper has been withdrawn.

This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2080.

This paper is wrong and is therefore withdrawn.

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The authors have withdrawn this paper.

The paper has been withdrawn

This paper has been withdrawn by the author.

This paper has been withdrawn while the author verifies the literature.

This paper was withdrawn by the authors.

The paper is withdrawn by the author due to an oversimplified and misleading approach which was taken initially as a starting point.