@InProceedings{Haustein:2004:WRKUMLOMDE,
  author =       "Stefan Haustein and J{\"o}rg Pleumann",
  title =        "{OCL} as Expression Language in an Action Semantics
                  Surface Language",
  pages =        "99--113",
  booktitle =    "OCL and Model Driven Engineering, {UML} 2004 Conference
                  Workshop, October 12, 2004, Lisbon, Portugal",
  editor =       "Octavian Patrascoiu",
  publisher =    "University of Kent",
  year =         "2004",
}