@article{Rathgeber1994,
  author    = {Rathgeber, J{\"o}rg},
  title     = {Winterliche Beobachtungen an der Rohrdommel in Berlin},
  issn      = {0028-1301},
  year      = {1994},
  language  = {de}
}
@article{WallschlaegerRathgeber2006,
  author    = {Wallschl{\"a}ger, Hans-Dieter and Rathgeber, J{\"o}rg},
  title     = {Beitr{\"a}ge zur Biologie einiger Spechtarten in S{\"u}dbrasilien},
  issn      = {0030-5723},
  year      = {2006},
  language  = {de}
}