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This paper has been withdrawn by the authors, due a crucial error in Sec. 3.

This paper has been withdrawn by the author due to a crucial sign error in Theorem 3.4.

This paper has been withdrawn due to errors in the analysis of data with Carrier Access Rate control and statistical methodologies.

This paper has been withdrawn.

This paper is withdrawn.

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn by the author due to the need for further revision.

This paper has been withdrawn.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

The paper is being withdrawn because of some theoretical inconsistencies.

The paper has been withdrawn because the proof of part (b) of the main theorem is incomplete.

This paper has been withdrawn due to a crucial theoretical and experimental error.

This paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn by the author(s), due to a crucial error in eq. 6.

This paper has been withdrawn by the author(s) due to the discussion was made on the basis of linear term merely, which is incomplete.

There are several serious errors in this paper. I thought to have time to fix it, but it did not occur for years. So I withdraw this paper.

This paper has been withdrawn at the author's request.

This paper has been withdrawn by the author due to a crucial error.

This paper has been withdrawn by the author due to a crucial sign error.