@article{GrassmannKlunterMirwaldetal.1995,
  author    = {Marianne Grassmann and Martina Klunter and Elke Mirwald and Ute Veith},
  title     = {Was k{\"o}nnen Schulanf{\"a}nger bereits vor ihrer ersten Mathematikstunde?},
  year      = {1995},
}