@article{50183,
  author       = {{Hohmann, Sascha}},
  issn         = {{0025-5807}},
  journal      = {{Der Mathematikunterricht}},
  number       = {{2023}},
  pages        = {{21--32}},
  publisher    = {{Friedrich-Verlag}},
  title        = {{{Himmelskörper mit Geometrie}}},
  volume       = {{02}},
  year         = {{2023}},
}

@article{51703,
  author       = {{Werth, Gerda}},
  issn         = {{0025-5807}},
  journal      = {{MU Der Mathematikunterricht}},
  number       = {{2}},
  pages        = {{17--33}},
  title        = {{{"Guter" Raumlehreunterricht aus der Sicht des Reformpädagogen und Volksschullehrers Ernst Heywang}}},
  volume       = {{63}},
  year         = {{2017}},
}

@book{17461,
  editor       = {{Peckhaus, Volker}},
  issn         = {{0025-5807}},
  pages        = {{64}},
  title        = {{{Der Mathematikunterricht 53, H. 5: Schwerpunkt: Philosophie und Mathematik}}},
  year         = {{2007}},
}