@TechReport{KrappWestfechtel97,
  author =    "Carl-Arndt Krapp and Bernhard Westfechtel",
  title =     "Feedback {H}andling in {D}ynamic {T}ask {N}ets",
  institution = "RWTH Aachen",
  year =      "1997",
  number =    "AIB-09-1997",
  url =       "http://aib.informatik.rwth-aachen.de/1997/1997-09.ps.gz",
}