@article{MuehleBurkartPoetsch1998,
  author    = {M{\"u}hle, Ralf-Udo and Burkart, Michael and P{\"o}tsch, Joachim},
  title     = {On the importance of flooded grassland at the Ramsar site of the lower Havel river valley for waterfowl},
  issn      = {0761-9243},
  year      = {1998},
  language  = {en}
}
@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}
}