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This paper has been withdrawn due to its publication

The paper was withdrawn by the author. Further research is needed.

This paper has been withdrawn by the authors due to an error first noted by M. Lukin.

This paper has been withdrawn by the authors due to numerical problems to get viable results.

This paper has been withdrawn.

This paper has been withdrawn by the author, due to a significant error in section 4.3.1.

The paper is withdrawn by the author because it is superseded by cond-mat/0303357 .

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This paper has been withdrawn by the author. It will be published again after submission to a journal.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to unspecified problems.

This paper has been withdrawn by the authors due to an error.

This paper has been withdrawn by the author due to a misunderstanding.

The paper has been withdrawn by the authors. The contents of the paper will be used in a future communication which will contain major addition and shift of focus.

This paper has been withdrawn by the author(s) due to the discussion was made on the basis of linear term merely, which is incomplete.

This paper has been withdrawn

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

The paper has been withdrawn.

This paper has been withdrawn due to errors in the analysis of data with Carrier Access Rate control and statistical methodologies.

This paper has been withdrawn by the authors. due fail of replacement of the paper. new version is hep-ph/0201214.