@book{GrassmannKlunterKoehleretal.2002,
  author    = {Grassmann, Marianne and Klunter, Martina and K{\"o}hler, Egon and Mirwald, Elke and Raudies, Monika and Thiel, Oliver},
  title     = {Mathematische Kompetenzen von Schulanf{\"a}ngern : Teil 1; Kinderleistungen - Lehrererwartungen},
  series = {Potsdamer Studien zur Grundschulforschung},
  volume    = {30},
  journal   = {Potsdamer Studien zur Grundschulforschung},
  publisher = {Univ.},
  address   = {Potsdam},
  isbn      = {3-935924-51-7},
  issn      = {0945-6643},
  pages     = {72 S., Anhang},
  year      = {2002},
  language  = {de}
}
@book{GrassmannKlunterKoehleretal.2002,
  author    = {Grassmann, Marianne and Klunter, Martina and K{\"o}hler, Egon and Mirwald, Elke and Raudies, Monika and Thiel, Oliver},
  title     = {Mathematische Kompetenzen von Schulanf{\"a}ngern : Teil 2; Was k{\"o}nnen Kinder am Ende der Klasse1?},
  series = {Potsdamer Studien zur Grundschulforschung},
  volume    = {31},
  journal   = {Potsdamer Studien zur Grundschulforschung},
  publisher = {Universit{\"a}tsverl. Potsdam; Universit{\"a}tsbibliothek},
  address   = {Potsdam; Potsdam},
  isbn      = {3-935024-75-4},
  issn      = {0945-6643},
  pages     = {86 S.},
  year      = {2002},
  language  = {de}
}
@article{Koehler2000,
  author    = {K{\"o}hler, Egon},
  title     = {{\"U}ber Antreteordnungen und Treppenh{\"u}pfen - geometrische Figuren, Zahlen und Zahlenfolgen},
  year      = {2000},
  language  = {de}
}
@book{KlunterKoehlerRaudies2000,
  author    = {Klunter, Martina and K{\"o}hler, Egon and Raudies, Monika},
  title     = {Ermittlung von Sach- und Methodenkompetenz in den Klassen 5 und 6 im Fach Mathematik},
  series = {Potsdamer Studien zur Grundschulforschung},
  volume    = {27},
  journal   = {Potsdamer Studien zur Grundschulforschung},
  publisher = {Univ.-Bibliothek Publ.-Stelle},
  address   = {Potsdam},
  isbn      = {978-3-935024-19-8},
  issn      = {0945-6643},
  pages     = {55 S.},
  year      = {2000},
  language  = {de}
}
@article{Koehler1999,
  author    = {K{\"o}hler, Egon},
  title     = {Vom Fliesenlegen zu Pentominopuzzles},
  year      = {1999},
  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{Koehler1998,
  author    = {K{\"o}hler, Egon},
  title     = {Drei auf einen Streich : Spielen, Bruchrechnung, Geometrie},
  year      = {1998},
  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{Koehler1997,
  author    = {K{\"o}hler, Egon},
  title     = {Erfindertraining in der Grundschule},
  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}
}