@InProceedings{GieseHeldal04,
  author = {Martin Giese and Rogardt Heldal},
  title = {From Informal to Formal Specifications in {UML}},
  pages = {197--211},
  booktitle  = {Proc. of UML2004, Lisbon},
  editor = {Thomas Baar and Alfred Strohmeier and
            Ana Moreira and Stephen J. Mellor},
  year = {2004},
  series = {LNCS},
  volume = {3273},
  publisher = {Springer}
}