@INPROCEEDINGS{ZRH01,
  author    = {W.P. Zhang and Norbert Ritter and Theo Härder},
  title     = {Enriched Relationship Processing in Object-Relational Database Management Systems},
  booktitle = {Proc. 3rd Int. Symposium on Cooperative Database Systems for Advanced Applications (CODAS'01)},
  year      = {2001},
  pages     = {53-62},
  month     = {4}
}