Related papers: Nonlinear System Identification and Behavioral Mod…

This paper has been withdrawn. A significantly revised version will be posted in the near future.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author; see the much expanded, improved, and generalized version at arXiv:0811.2080.

This paper has been withdrawn by the author for further investigation.

This paper has been withdrawn by the author

This paper has been withdrawn by the author because the conclusions reached in it are incorrect.

The paper has been withdrawn by the author.

This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This paper has been withdrawn by the author due a few mistakes in the paper.

This paper has been withdrawn. See published paper http://arxiv.org/math.HO/0512390

This paper has been withdrawn.

This paper has been withdrawn

This paper has been withdrawn by the author

The paper has been withdrawn

This paper has been withdrawn.

This paper has been withdrawn by the author due to incomplete interpretation for the results.

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn by the author

This paper has been withdrawn by the author.