@article{GrassmannKlunterMirwaldetal.1995,
  author    = {Grassmann, Marianne and Klunter, Martina and Mirwald, Elke and Veith, Ute},
  title     = {Was k{\"o}nnen Schulanf{\"a}nger bereits vor ihrer ersten Mathematikstunde?},
  year      = {1995},
  language  = {de}
}
@article{KlunterRaudiesKoehler2005,
  author    = {Klunter, Martina and Raudies, Monika and K{\"o}hler, Egon},
  title     = {Veranschaulichungen beim L{\"o}sen von Sachaufgaben-Beobachtungen bei Vierkl{\"a}sslern},
  year      = {2005},
  language  = {de}
}
@article{KoehlerKlunterRaudies2005,
  author    = {K{\"o}hler, Egon and Klunter, Martina and Raudies, Monika},
  title     = {Veranschaulichungen beim L{\"o}sen von Sachaufgaben : Beobachtungen bei Viertkl{\"a}sslern},
  year      = {2005},
  language  = {de}
}
@article{GrassmannMirwaldKlunteretal.2000,
  author    = {Grassmann, Marianne and Mirwald, Elke and Klunter, Martina and Veith, Ute},
  title     = {Untersuchungen {\"u}ber Vorkenntnisse von Schulkindern zu zentralen Inhalten des Mathematikunterrichts der Klasse 4, Teil 2},
  year      = {2000},
  language  = {de}
}
@article{GrassmannMirwaldKlunteretal.2000,
  author    = {Grassmann, Marianne and Mirwald, Elke and Klunter, Martina and Veith, Ute},
  title     = {Untersuchungen {\"u}ber Vorkenntnisse von Schulkindern zu zentralen Inhalten des Mathematikunterrichts der Klasse 4, Teil 1},
  year      = {2000},
  language  = {de}
}
@article{GrassmannKlunterMirwaldetal.1998,
  author    = {Grassmann, Marianne and Klunter, Martina and Mirwald, Elke and Veith, Ute},
  title     = {Untersuchungen {\"u}ber Vorkenntnisse und Informelle L{\"o}sungsstrategien zu zentralen Inhalten des Mathematikunterrichts der Klasse 3},
  issn      = {0949-6785},
  year      = {1998},
  language  = {de}
}
@article{KlunterVeith1996,
  author    = {Klunter, Martina and Veith, Ute},
  title     = {Untersuchungen zu informellen L{\"o}sungsstrategien von Grundschulkindern zu zentralen Inhalten des Mathematikunterrichts der Klasse 2 am Beginn des 2. Schuljahres},
  year      = {1996},
  language  = {de}
}
@article{KlunterRaudies2005,
  author    = {Klunter, Martina and Raudies, Monika},
  title     = {Sachrechnen und Differenzierung},
  year      = {2005},
  language  = {de}
}
@article{PrengelKlunterRaudiesetal.2004,
  author    = {Prengel, Annedore and Klunter, Martina and Raudies, Monika and Zwack-Stier, Charlotte},
  title     = {Mathematik},
  year      = {2004},
  language  = {de}
}
@article{KlunterRaudies2005,
  author    = {Klunter, Martina and Raudies, Monika},
  title     = {K{\"a}fer Kunis Knobeleien},
  year      = {2005},
  language  = {de}
}