@InProceedings{Gogolla:1998:ERUCD,
  author =       "Martin Gogolla and Mark Richters",
  title =        "Equivalence Rules for {UML} Class Diagrams",
  pages =        "87--96",
  booktitle =    "The Unified Modeling Language, UML'98 - Beyond the
                  Notation. First International Workshop, Mulhouse, France,
                  June 1998",
  editor =       "Jean B{\'e}zivin and Pierre-Alain Muller",
  year =         "1998",
}