@book{Maether1986,
  author    = {Maether, Christiane},
  title     = {Arbeiten von 1973 - 1985 / Hrsg.: Berthold Roland},
  publisher = {Landesmuseum},
  address   = {Mainz},
  pages     = {71 S. : {\"u}berw. Ill.},
  year      = {1986},
  language  = {de}
}
@article{Siepmann1986,
  author    = {Siepmann, Thomas},
  title     = {Abschlußbericht zum Vorhaben Nr. 22/IV},
  series = {Forschungsvereinigung Antriebstechnik: Forschungsreport},
  journal   = {Forschungsvereinigung Antriebstechnik: Forschungsreport},
  publisher = {FVA},
  address   = {Frankfurt/M.},
  year      = {1986},
  language  = {de}
}