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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author, due to a significant error in section 4.3.1.

This paper has been withdrawn by the authors due to its publication

This paper has been withdrawn by the author due to unspecified problems.

This paper has been withdrawn by the author due to an error in the derivation.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author.

This paper has been withdrawn. It was an early draft submitted prematurely in error. A complete version is to be submitted shortly.

This paper has been withdrawn to address an omission. It will be resubmitted in the near future.

This paper has been withdrawn by the author: it was a too preliminary version.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

Title: An unlikely result Authors: T.M. Other Comments: This paper has been withdrawn Abstract: This paper has been withdrawn by the author due to the fact that some of the results turned out to be known.

This paper has been withdrawn by the author, due an error in the proof of Proposion 2.13.

The paper is withdrawn.

This paper has been withdrawn by the author due to an error in the proof of Proposition 4.8.

This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

This paper has been withdrawn by the authors.