@article{Liebherr1994,
  author    = {Liebherr, Helga},
  title     = {Markierung von Saat- und Bleßg{\"a}nsen 1992 und 1993},
  year      = {1994},
  language  = {de}
}
@article{RutschkeLiebherr1995,
  author    = {Rutschke, Erich and Liebherr, Helga},
  title     = {Bestand und Bestandsentwicklung einiger Wildentenarten in Ostdeutschland : Ergebnisse 25j{\"a}hriger Wasservogelz{\"a}hlungen},
  year      = {1995},
  language  = {de}
}
@article{HlinakMuellerKrameretal.1998,
  author    = {Hlinak, Andreas and M{\"u}ller, Thomas and Kramer, Matthias and M{\"u}hle, Ralf-Udo and Liebherr, Helga and Ziedler, Klaus},
  title     = {Serological survey of viral pathogens in bean and white-fronted geese from Germany},
  issn      = {0090-3558},
  year      = {1998},
  language  = {en}
}
@article{RutschkeLiebherr1996,
  author    = {Rutschke, Erich and Liebherr, Helga},
  title     = {G{\"a}ste aus dem hohen Norden : neue Forschungsergebnisse zur Saatgans},
  year      = {1996},
  language  = {de}
}
@article{RutschkeLiebherr1996,
  author    = {Rutschke, Erich and Liebherr, Helga},
  title     = {Neue Erkenntnisse {\"u}ber die Wanderungen der Saatgans (Anser fabalis Latham)},
  year      = {1996},
  language  = {de}
}
@article{RutschkeLiebherr1996,
  author    = {Rutschke, Erich and Liebherr, Helga},
  title     = {Ergebnisse der Wasservogelz{\"a}hlungen in der Saison 1993/94 (neue Bundesl{\"a}nder)},
  year      = {1996},
  language  = {de}
}
@article{RutschkeLiebherr1996,
  author    = {Rutschke, Erich and Liebherr, Helga},
  title     = {Ergebnisse der Wasservogelz{\"a}hlungen in der Saison 1994/95 (neue Bundesl{\"a}nder)},
  year      = {1996},
  language  = {de}
}
@article{HlinakMuellerKrameretal.1999,
  author    = {Hlinak, Andreas and M{\"u}ller, Thomas and Kramer, Matthias and M{\"u}hle, Ralf-Udo and Liebherr, Helga and Ziedler, Klaus},
  title     = {A descriptive analysis of the potenrial association between migration patterns of bean and white-fronted geese and the occurence of newcastle disease outbreaks in domestic birds},
  issn      = {0005-2086},
  year      = {1999},
  abstract  = {Sightings and migration patterns of 65 bean and 65 white-fronted geese are reported. These geese were tagged and serologically screened. 19 of the 53 birds sighted had serologic evidence of Newcastle Disease. The migration patterns of the wild geese provided further evidence that the main resting and wintering sites of migratory waterfowl are likely to be important for the inter- and intraspecies transmission of avian diseases.},
  language  = {en}
}