@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}
}