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This paper has been withdrawn by the author, due to errors in the figures.

This paper has been withdrawn by the author,due a immature idea.

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This paper has been withdrawn by the author, due to a significant error in section 4.3.1.

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The paper has been withdrawn by authors. The issues studied in this paper were changed so much that we have published a new paper considering these issues. See hep-th/0406074

This paper has been withdrawn by the author(s), due to a crucial error in eq. 6.

This paper has been withdrawn as the result is not correct.

This paper has been withdrawn due to errors in the analysis of data with Carrier Access Rate control and statistical methodologies.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This paper has been withdrawn by the authors.

This paper has been withdrawn by the author due to a crucial error in the formulation.

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This paper has been withdrawn by the authors due to an unlikely results.

This paper has been withdrawn by the author(s) in the light of several other works available and due to a misunderstanding in the authorships.

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This paper has been withdrawn by the author due to essential mistakes in some previous versions.

This paper has been withdrawn by the authors pending corrections.