@InProceedings{Niehaus01Adap,
  author="J. Niehaus and W. Banzhaf", 
  title="Adaption of Operator Probabilities in Genetic Programming",
  editor="J. Miller and M. Tomassini and P.-L. Lanzi and C. Ryan and A. Tettamanzi and W. B. Langdon",
  booktitle="Proceedings of 4th EuroGP Conference",
  pages="325--336",
  year=2001}