@Book{Hengstenberg.2003,
  author = {Hengstenberg, Oliver and Borys, Bernd-Burkhard and Gudehus, Thomas C.},
  title  = {Kooperativer Flughafenbetrieb: Abschlussbericht zum DFG-Forschungsvorhaben "Kooperative Planung und Disposition mit dem Ziel einer optimalen Nutzung vorhandener Flughafenkapazitäten"},

  year   = {2003},
  number = {},
  url    = {},

  const  = {\ text}
}
@Book{Hengstenberg.2003,
  author = {Hengstenberg, Oliver and Borys, Bernd-Burkhard and Gudehus, Thomas C.},
  title  = {Kooperativer Flughafenbetrieb: Abschlussbericht zum DFG-Forschungsvorhaben ''Kooperative Planung und Disposition mit dem Ziel einer optimalen Nutzung vorhandener Flughafenkapazit\"aten''},

  year   = {2003},
  number = {},
  url    = {},

  const  = {\ text}
}
@Proceedings{Borys.1997c,

  title  = {Proceedings of the XVI. European Annual Conference on Human Decision Making and Manual Control},

  year   = {1997},
  number = {},
  url    = {http://www.imat.maschinenbau.uni-kassel.de/eam/index.html},

  const  = {\ text}
}
@Proceedings{Johannsen.1993,

  title  = {Proceedings of the XII. European Annual Conference on Human Decision Making and Manual Control: Held at the University of Kassel Kassel Germany June 22 - 24 1993: 22,-24, Juni 1993},

  year   = {1993},
  number = {},
  url    = {},

  const  = {\ text}
}