@TechReport{Pohl96,
  author =    "Klaus Pohl",
  title =     "Requirements {E}ngineering: {A}n {O}verview",
  institution = "RWTH Aachen",
  year =      "1996",
  number =    "AIB-05-1996",
  url =       "http://aib.informatik.rwth-aachen.de/1996/1996-05.ps.gz",
}