@TechReport{Zuendorf92,
  author =    "Albert Zuendorf",
  title =     "Implementation of the imperative / rule based language {PROGRES}",
  institution = "RWTH Aachen",
  year =      "1992",
  number =    "AIB-38-1992",
  url =       "http://aib.informatik.rwth-aachen.de/1992/1992-38.ps.gz",
}