@book{OPUS4-28979,
  title     = {OTIS : Zeitschrift der Arbeitsgemeinschaft Berlin-Brandenburgischer Ornithologen},
  editor    = {Wallschl{\"a}ger, Hans-Dieter},
  year      = {1993},
  language  = {de}
}
@book{OPUS4-28978,
  title     = {Botanische Wanderungen in deutschen L{\"a}ndern : [Die sch{\"o}nsten Exkursionen]},
  editor    = {P{\"o}tsch, Joachim and Weinert, Erich},
  publisher = {Urania-Verl.},
  address   = {Leipzig [u.a.]},
  year      = {1993},
  language  = {de}
}
@article{SchneiderMuellerWilke1993,
  author    = {Schneider, Ingo and M{\"u}ller, Bernd and Wilke, U.-B},
  title     = {Saisonal variation of microorganisms in a sewage farm ares south of Berlin},
  year      = {1993},
  language  = {en}
}