1Institute for Operations Research, ETH Zurich, 8092 Zurich, Switzerland. E-mail: marco.laumanns@ifor.math.ethz.ch
2Institute for Applied Computer Science and Formal Description Methods, University of Karlsruhe, 76128 Karlsruhe, Germany. E-mail: smo@aifb.uni-karlsruhe.de
3Department of Computer Science, Chair of Algorithm Engineering, University of Dortmund, 44227 Dortmund, Germany. E-mail: Guenter.Rudolph@uni-dortmund.de
4Department of Computer Science 12, University of Erlangen-Nuremberg, 91058 Erlangen, Germany. E-mail: teich@informatik.uni-erlangen.de
