@InProceedings{ernst97,
  author =       {Erik Ernst},
  title =        {Constraint Based Inheritance},
  crossref =     {PhDOOS97},
  pages =        {25-34}
}

@Proceedings{PhDOOS97,
  title =        {Proceedings of the 7th Workshop for {PhD} Students in
                  Object-Oriented Systems},
  year =         1997,
  editor =       {Erik Ernst and Lutz Wohlrab and Frank Gerhardt},
  series =       {DAIMI PB-526},
  organization = {Dept. of Computer Science, University of \AA{}rhus},
  address =      {\AA{}rhus, Denmark}
}