@article{KeitelKaiser1994,
  author    = {Keitel, Christine and Kaiser, Gabriele},
  title     = {Assessing mathematics in Europe : the Federal Republic of Germany},
  year      = {1994},
  language  = {en}
}
@article{KaiserRogers1994,
  author    = {Kaiser, Gabriele and Rogers, Patricia},
  title     = {Gender and mathematics education},
  year      = {1994},
  language  = {en}
}