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This paper has been withdrawn by the authors, since the reference citation were not appropriately arranged.

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This paper has been withdrawn by the authors due to some fatal errors in the analysis.

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This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors. Significantly revised versions of the results of this paper are now available in arXiv:0707.0487v2 and arXiv:0808.3169v1.

This paper has been retracted, for obvious reasons.

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This paper has been withdrawn by the author.

This paper has been withdrawn by the author because the conclusions reached in it are incorrect.

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This paper is withdrawn. The revised paper appears in chao-dyn/9904020

This paper has been withdrawn by the authors.

This paper has been temporarily withdrawn for corrections.

This paper has been withdrawn due to errors in the analysis of data with Carrier Access Rate control and statistical methodologies.