@article{UBHD-68067865,
  author={Dralle, Henning and Klee, Friedrich and B{\"u}chler, Markus W.},
  title={Komplizierter Verlauf einer laparoskopischen Cholezystektomie},
  year={2015},
  pages={893-896},
  language={ger and eng},
  issn={1433-0385},
  volume={86},
  number={9},
  note={Gesehen am 22.12.2016},
  journal={Der Chirurg},
  editor={Ewerbeck, Volker},
  doi={10.1007/s00104-015-0055-3},
}
@article{UBHD-68019356,
  author={Osswald, Brigitte and Klee, Friedrich and Wysocki, Stefan},
  title={The reliability of highly elevated CA 19-9 levels},
  year={1993},
  pages={275-278},
  language={eng},
  issn={1875-8630},
  volume={11},
  number={5/6},
  note={Gesehen am 18.08.2016},
  journal={Disease markers},
}