@article{MeierKessel1992,
  author    = {Meier, Bernd and Kessel, Peter},
  title     = {Die Font{\"a}nen von Sanssouci : ein Unterrichtsentwurf f{\"u}r die Sekundarstufe I},
  year      = {1992},
  language  = {de}
}
@article{MeierKessel1992,
  author    = {Meier, Bernd and Kessel, Peter},
  title     = {Die Fallstudie im Technik-Unterricht},
  year      = {1992},
  language  = {de}
}