| Autor: |
Hansen, Nico A., Kessler, Anke S. **Corresponding author. This work has benefitted from discussions with Dieter Bös, Christian Everhart, Christoph Lülfesmann, and Urs Schweizer. We are also greatly indebted to two anonymous referees. Their comments and suggestions helped to revise and simplify various proofs and significantly improved the exposition. Financial support by Deutsche Forschungsgemeinschaft through the SFB 303 at the University of Bonn, is gratefully acknowledged. Remaining errors are our own. |
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