@TechReport{Jarke92,
  author =    "Matthias Jarke",
  title =     "Concept{B}ase {V}3.1 {U}ser {M}anual",
  institution = "RWTH Aachen",
  year =      "1992",
  number =    "AIB-17-1992",
  url =       "http://aib.informatik.rwth-aachen.de/1992/1992-17.ps.gz",
}