@article{RotheMetzDegener1999,
  author    = {Rothe, Heinz-J{\"u}rgen and Metz, Anna-Marie and Degener, Mirko},
  title     = {Mental load of call center agents},
  year      = {1999},
  language  = {en}
}
@article{RibbackKalyttaMetz1999,
  author    = {Ribback, Sven and Kalytta, T. and Metz, Anna-Marie},
  title     = {Heart frequency changes of professors and students in oral examinations},
  year      = {1999},
  language  = {en}
}