@article{Koehler1995,
  author    = {K{\"o}hler, Egon},
  title     = {Wenn die Prinzessin kalte F{\"u}ße hat},
  year      = {1995},
  language  = {de}
}
@article{Koehler1995,
  author    = {K{\"o}hler, Egon},
  title     = {Ist K{\"a}stchenausz{\"a}hlen Messen?},
  year      = {1995},
  language  = {de}
}
@article{Koehler1996,
  author    = {K{\"o}hler, Egon},
  title     = {Wirklichkeit, Geometrie und Geometrieunterricht in der Grundschule},
  year      = {1996},
  language  = {de}
}
@article{KoehlerRaudies1997,
  author    = {K{\"o}hler, Egon and Raudies, Monika},
  title     = {Gedanken zur Weiterentwicklung des Mathematikunterrichtes in der Grundschule},
  issn      = {0945-6643},
  year      = {1997},
  language  = {de}
}
@article{KoehlerRaudies1997,
  author    = {K{\"o}hler, Egon and Raudies, Monika},
  title     = {Zuf{\"a}lle und Geometrie im Unterricht},
  year      = {1997},
  language  = {de}
}
@article{Koehler1997,
  author    = {K{\"o}hler, Egon},
  title     = {Erfindertraining in der Grundschule},
  year      = {1997},
  language  = {de}
}
@article{Koehler1998,
  author    = {K{\"o}hler, Egon},
  title     = {Drei auf einen Streich : Spielen, Bruchrechnen, Geometrie, Teil 2: Die Geometrie der neun N{\"a}gel},
  year      = {1998},
  language  = {de}
}
@article{Koehler1998,
  author    = {K{\"o}hler, Egon},
  title     = {Drei auf einen Streich : Spielen, Bruchrechnung, Geometrie},
  year      = {1998},
  language  = {de}
}
@article{Koehler1999,
  author    = {K{\"o}hler, Egon},
  title     = {Mausek{\"a}se oder Experimente mit kleinen W{\"u}rfeln},
  year      = {1999},
  language  = {de}
}
@article{Koehler1999,
  author    = {K{\"o}hler, Egon},
  title     = {Vom Fliesenlegen zu Pentominopuzzles},
  year      = {1999},
  language  = {de}
}