@book{Siepmann1987,
  author    = {Siepmann, Thomas},
  title     = {Reibmomente in Zylinderrollenlagern f{\"u}r Planetenr{\"a}der},
  address   = {Bochum},
  isbn      = {3-89194-068-8},
  pages     = {279 S. : graph. Darst.},
  year      = {1987},
  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}
}