@article{Meyerhoefer2006,
  author    = {Wolfram Meyerh{\"o}fer},
  title     = {Untersuchungen zum PISA - Mathematik - Test},
  journal   = {LLF-Berichte / Universit{\"a}t Potsdam, Zentrum f{\"u}r Lehrerbildung},
  volume    = {20},
  pages     = {73 -- 91},
  year      = {2006},
}