@TechReport{WinterSch\"urr97,
   author=      {Andreas Winter, Andy Sch\"urr},
   title=       "Modules and {U}pdatable {G}raph {V}iews for {PRO}grammed {G}raph {RE}writing {S}ystems",
   institution= "RWTH Aachen",
   year=        "1997",
   number=      "AIB-03-1997",
   url=         "http://aib.informatik.rwth-aachen.de/1997/1997-03.ps.gz"
}