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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

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This paper has been withdrawn by the author, since one of the key results duplicates existing work, as pointed out by a reader. I am currently revising the manuscript.

This paper has been withdrawn by the author.

The paper has been withdrawn by the authors.

This paper has been withdrawn by the author due to the need for further revision.

This paper has been withdrawn by the author due to a crucial problem associated with Figs. 2 and 3.

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This paper has been withdrawn by the author, since the author does not have enough time to answer every questions on this result.

This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

This paper was withdrawn by the author due to an edition's rights

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This paper has been withdrawn by the author(s), due to acceptance of the paper for publication in Physical Chemistry Chemical Physics.

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This paper has been withdrawn by the author due to a coming paper completely superseding it.

This paper has been withdrawn by the author ali pourmohammad.

This paper has been withdrawn by the author.

This paper was withdrawn by the author.