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This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

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This paper is withdrawn. See quant-ph/9806031 for a discussion.

This paper has been withdrawn by the author(s), due to technical copyright problems with the Royal Society of Chemistry.

This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.

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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

None. This paper has been withdrawn by the authors.

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This paper was withdrawn by the authors.

This paper has been withdrawn by the author

This paper has been withdrawn by the authors.