@article{UBHD-67498060,
  author={Bien, Reinhold and Waßmer, Norbert and Wielen, Roland},
  title={Results on the evolution of small groups of galaxies using the superbox code},
  year={1996},
  pages={202},
  language={eng},
  volume={22},
  journal={Proceedings of the ... general assembly},
}
@article{UBHD-67498067,
  author={Waßmer, Norbert and Bien, Reinhold and Fuchs, Burkhard and Wielen, Roland},
  title={Close encounters of elliptical galaxies},
  subtitle={an interpretation of the morphological asymmetry},
  year={1993},
  pages={78-79},
  language={eng},
  volume={9},
  note={Gesehen am 15.11.2013},
  journal={Abstract series},
}
@incollection{UBHD-67492185,
  author={Waßmer, Norbert and Bien, Reinhold and Wielen, Roland},
  title={Dynamics of massive black holes in the center of interacting galaxies},
  year={1996},
  pages={466},
  language={eng},
  isbn={0-7923-3975-4 and 0-7923-3976-2 and 978-0-7923-3975-5 and 978-0-7923-3976-2},
  booktitle={New light on galaxy evolution},
  editor={Bender, Ralf and Davies, Roger L.},
}