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This article was withdrawn by the arXiv.org administrators since it plagiarizes math.GT/0011056.

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Erroneous submission in violation of copyright, removed by arXiv admin.

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This submission is a duplicate of arXiv:q-bio/0602024 and has been removed.

Withdrawn by arXiv administration. This article was plagiarised directly from http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5061961 , which appeared in the conference INFOCOM 2009.

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This paper has been removed by arXiv administrators because it plagiarizes gr-qc/0203084, gr-qc/0607138, gr-qc/0011087, gr-qc/0102070, gr-qc/0607138, gr-qc/0109017, gr-qc/0212018, and gr-qc/9409039.

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This paper has been withdrawn by the author, because a profoundly overhauled and improved version, also with a new title and two more authors, has now been submitted to the arXiv, with no. hep-ph/0310059. In view of the elapsed time and the…