@InProceedings{HaehnleRanta01a,
  author =       {Reiner H\"{a}hnle and Aarne Ranta},
  title =        {Connecting {OCL} with the Rest of the World},
  booktitle =    {WTUML: Workshop on Transformations in UML at ETAPS, Genova, Italy},
  year =         {2001},
  month =        apr,
  editor =       {Jon Whittle},
  url =          {http://www.cs.chalmers.se/~reiner/papers/wtuml.ps.gz} 
}