@article{StrohmeierEichholz1981,
  author    = {Strohmeier, Andreas and Eichholz, G{\"u}nter},
  title     = {Elimination von Phosphaten in technisch bel{\"u}fteten Abwasserteichen / Eichholz, G{\"u}nter; Strohmeier, Andreas},
  series = {Wasser und Boden. 33 (1981), H. 5},
  journal   = {Wasser und Boden. 33 (1981), H. 5},
  isbn      = {0043-0951},
  pages     = {230 -- 239},
  year      = {1981},
  language  = {de}
}
@article{Polumsky1981,
  author    = {Polumsky, Dieter},
  title     = {Pr{\"a}missen und Methoden bei großr{\"a}umigen Verkehrsprognosen},
  publisher = {Inst.},
  address   = {Aachen},
  pages     = {67 -- 75},
  year      = {1981},
  language  = {de}
}
@book{KapplerSchueller1981,
  author    = {Kappler, Heinz and Schu{\"e}ller, Gerhart I.},
  title     = {Zuverl{\"a}ssigkeitsorientierte Bemessung von Meeresplattformen / G. I. Schueller},
  publisher = {Technische Universit{\"a}t, LKI},
  address   = {M{\"u}nchen},
  pages     = {71 S.},
  year      = {1981},
  language  = {de}
}