@article{HornLeisnerMikelskis2002,
  author    = {Horn, Martin Erik and Leisner, Antje and Mikelskis, Helmut},
  title     = {Probleme der Modellbildung in der Optik},
  isbn      = {3-936427-11-9},
  year      = {2002},
  language  = {de}
}
@article{MikelskisHornLeisneretal.2002,
  author    = {Mikelskis, Helmut and Horn, Martin Erik and Leisner, Antje and Mikelskis-Seifert, Silke},
  title     = {Modellbildung im Optikunterricht},
  isbn      = {3-88064-304-0},
  year      = {2002},
  language  = {de}
}