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Withdrawn. Submittal to journal withdrawn by author in Dec 1999.

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This paper has been withdrawn by the author

This paper has been withdrawn by the author.

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn by the authors due to the existence of main results in the literature.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors because the paper is largely revised and improved.

This paper has been withdrawn by the authors, due to issues concerning the use of unpublished experimental data.

This paper is withdrawn.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a misunderstanding.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to the appearence of enlarged version with one new author name more (hep-ph/0012293).

This paper is withdrawn. The revised paper appears in chao-dyn/9904020

This paper has been withdrawn by the authors due to new experimental results.

This paper was withdrawn by the authors.

This paper has been withdrawn by the author, due to a significant error in section 4.3.1.