@TechReport{BoerstlerJanning91,
  author =    {J\"urgen B\"orstler and Thorsten Janning},
  title =     "Bridging the gap between {R}equirements {A}nalysis and {D}esign",
  institution = "RWTH Aachen",
  year =      "1991",
  number =    "AIB-16-1991",
  url =       "http://aib.informatik.rwth-aachen.de/1991/1991-16.ps.gz",
}