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This paper has been withdrawn by the author, due to an error in Proposition 2.2.

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn by the authors, due a oversimplified decoherence model. It will be substituted by a new work.

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This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

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This paper has been withdrawn by the author: it was a too preliminary version.

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This paper has been withdrawn by the author due to an error in section 7. There is a new version: arXiv:1011.3352.

This paper has been withdrawn by the authors due to an error.

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This paper has been withdrawn by the author due to the appearence of enlarged version with one new author name more (hep-ph/0012293).

This paper has been withdrawn by the authors.