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This paper has been withdrawn by the author. A revised and expanded version is gr-qc/9907028 (Phys.Rev. D60 (1999) 104043).

This paper has been withdrawn by the author

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This paper has been withdrawn by the authors due to overlap with other papers.

This paper has been withdrawn by the author, since now all four parts of the review are available as a single file 0804.1639. I also made some revision of the text in order to avoid misprints and some inaccurate expressions.

This paper has been withdrawn by the author due to new results to be added.

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This paper has been withdrawn by the author.

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This paper has been withdrawn by the authors as requested by the journal.

This paper has been withdrawn due to errors in the analysis of data with Carrier Access Rate control and statistical methodologies.

The paper was retracted.

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