@article{GrassmannKlunterMirwaldetal.1995,
  author    = {Grassmann, Marianne and Klunter, Martina and Mirwald, Elke and Veith, Ute},
  title     = {Arithmetische Kompetenzen von Schulanf{\"a}ngern-Schlußfolgerungen f{\"u}r die Gestaltung des Anfangsunterrichts},
  year      = {1995},
  language  = {de}
}
@article{KlunterVeith1997,
  author    = {Klunter, Martina and Veith, Ute},
  title     = {Das Skizzieren als ein Hilfsmittel zum L{\"o}sen von mathematischen Problemen : wie uns Grundschulkinder mit ihren Ideen {\"u}berraschen},
  issn      = {0945-6643},
  year      = {1997},
  language  = {de}
}
@article{Klunter1994,
  author    = {Klunter, Martina},
  title     = {Ein Projekt : unser mathematisches Sportfest},
  year      = {1994},
  language  = {de}
}
@article{Klunter1994,
  author    = {Klunter, Martina},
  title     = {Freude an geometrischer T{\"a}tigkeit},
  year      = {1994},
  language  = {de}
}
@article{KlunterRaudies2005,
  author    = {Klunter, Martina and Raudies, Monika},
  title     = {K{\"a}fer Kunis Knobeleien},
  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     = {Sachrechnen und Differenzierung},
  year      = {2005},
  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{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{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}
}