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The paper has been withdrawn by the author.

This paper has been withdrawn by the author.

The paper has been withdrawn

This paper has been withdrawn by the authors due to new experimental results.

This submission has been withdrawn at the request of the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author, since one of the key results duplicates existing work, as pointed out by a reader.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This paper was withdrawn on 20.11.97.

This paper has been withdrawn by the authors, due an error involving the weak* convergence argument in section 2

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author to comply with the journal policy to which it has been submitted.

This paper has been withdrawn by the author due to the inaccurate result.

This paper has been withdrawn by the author due to a crucial problem in Lemma 3. This equation must be changed.

This paper has been withdrawn.

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.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This paper has been withdrawn by the author, due to a significant error in section 4.3.1.

The paper was withdrawn by the author.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