@InProceedings{ernst98a,
  author =       {Erik Ernst},
  title =        {Relative Types},
  crossref =     {PhDOOS98},
  pages =        {21--36}
}

@Proceedings{PhDOOS98,
  title =        {Position Papers from the 8th Workshop for 
                  {PhD} Students in Object-Oriented Systems},
  year =         1999,
  editor =       {Frank Gerhardt and Erik Ernst and Luigi Benedicenti},
  series =       {DAIMI-PB 535},
  publisher =    {Department of Computer Science, 
                  University of \AA{}rhus, Denmark}
}