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This paper has been withdrawn by the author due to the presented idea is wrong.

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This paper has been withdrawn by the author(s), due to a crucial error in eq. 6.

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This paper has been withdrawn by the author(s), due to technical copyright problems with the Royal Society of Chemistry.

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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been temporarily withdrawn by the author(s),

A modified version of this paper is under process and with a new title and abstract. Hence, this version of the article is completely withdrawn.

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This paper has been withdrawn by the author(s). Please see arXiv:0711.3910 for revision.

The paper was withdrawn by the author.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

This paper has been withdrawn by the authors.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

This paper has been removed by arXiv admin because it was an erroneous duplicate of astro-ph/9411031.