@TechReport{Schuerr94,
  author =    {Andy Sch\"uerr},
  title =     "{PROGRES}, {A} {V}isual {L}anguage and {E}nvironment for {PRO}gramming with {G}raph {RE}write {S}ystems",
  institution = "RWTH Aachen",
  year =      "1994",
  number =    "AIB-11-1994",
  url =       "http://aib.informatik.rwth-aachen.de/1994/1994-11.ps.gz",
}