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Acknowledgments

We thank H.W. Broer, J. Guckenheimer, R. Moeckel and P. Worfolk for helpful discussions and comments. P. Worfolk also provided Figure 15. B.K. thanks the NSF Science and Technology Research Center for the Computation and Visualization of Geometric Structures (The Geometry Center, Minneapolis) for its hospitality and support under NSF/DMS89-20161 during several visits. H.O. is grateful for the hospitality of the Theoretical Physics Group at the Free University, Amsterdam.

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Written by: Bernd Krauskopf & Hinke Osinga
Created: May 27 1997 --- Last modified: Fri May 30 19:56:22 1997