@inproceedings{conf/ewdw/GottlobKS90,
  title = "Semantics of Object-Oriented Data Models - The Evolving Algebra Approach",
  author = "Georg Gottlob and Gerti Kappel and Michael Schrefl",
  year = "1990",
  booktitle = "East/West Database Workshop",
  pages = "144-160",
}