@article{Wegener2001,
  author    = {Wegener, Heide},
  title     = {The evolution of the German modal particle "denn"},
  isbn      = {90-272-2954-6},
  year      = {2001},
  language  = {en}
}
@article{Wegener2001,
  author    = {Wegener, Heide},
  title     = {Pragmatisch motivierter Perspektivenwechsel im Spracherwerb},
  year      = {2001},
  language  = {de}
}