@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}
}
@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}
}
@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}
}