@article{Fischer2008,
  author    = {Helga Fischer},
  title     = {Das Triumphgeschrei der Graugans (Anser anser)},
  journal   = {Zeitschrift f{\"u}r Tierpsychologie},
  volume    = {22},
  number    = {3},
  pages     = {247 -- 304},
  year      = {2008},
}