1. Institute for Software Technology, Graz University of Technology, Graz, Austria.
2. Institute for Numerical and Applied Mathematics, University of Göttingen, Göttingen, Germany.
3. Institute for Mathematics, University of Kassel, Kassel, Germany.
4. Continentale Krankenversicherung a.G., Dortmund, Germany.
5. Department of Statistics and Operations Research, University of Graz, Graz, Austria.
6. Institute of Theoretical Computer Science, ETH Zürich, Zurich, Switzerland.