@article{MeierDuismannFastetal.2006,
  author    = {Meier, Bernd and Duismann, Gerhard and Fast, Ludger and Meschenmoser, Helmut},
  title     = {Lernr{\"a}ume gestalten},
  year      = {2006},
  language  = {de}
}
@article{MeierMeschenmoser2006,
  author    = {Meier, Bernd and Meschenmoser, Helmut},
  title     = {Erst wenn nichts mehr geht ...},
  year      = {2006},
  language  = {de}
}