@book{GrassmannKlunterKoehleretal.2002,
  author    = {Marianne Grassmann and Martina Klunter and Egon K{\"o}hler and Elke Mirwald and Monika Raudies and Oliver Thiel},
  title     = {Mathematische Kompetenzen von Schulanf{\"a}ngern : Teil 2; Was k{\"o}nnen Kinder am Ende der Klasse1?},
  volume    = {31},
  isbn      = {3-935024-75-4},
  year      = {2002},
}