@TechReport{Boerstler92,
  author =    {J\"urgen B\"orstler},
  title =     "Feature-{O}riented {C}lassification and {R}euse in {IPSEN}",
  institution = "RWTH Aachen",
  year =      "1992",
  number =    "AIB-35-1992",
  url =       "http://aib.informatik.rwth-aachen.de/1992/1992-35.ps.gz",
}