@Inproceedings{ls_leimeister,
  author = {Fähling, Jens and Köbler, Felix and Leimeister, Jan Marco and Krcmar, Helmut},
  title  = {Wahrgenommener Wert von IT in Krankenhäusern - Eine empirische Studie},

  year   = {2009},
  number = {},
  url    = {http://www.uni-kassel.de/fb7/ibwl/leimeister/pub/JML_122.pdf},

  const  = {\ text}
}
@Inproceedings{ls_leimeister,
  author = {Fähling, Jens and Köbler, Felix and Leimeister, Jan Marco and Krcmar, Helmut},
  title  = {Wahrgenommener Wert von IT in Krankenhäusern - Eine empirische Studie},

  year   = {2009},
  number = {},
  url    = {http://pubs.wi-kassel.de/wp-content/uploads/2013/03/JML_164.pdf},

  const  = {\ text}
}