@misc{SponagelWachowitz1992,
  author    = {Sponagel, Stefan and Wachowitz, Waldemar},
  title     = {Shaft seal : United States Patent 5,143,385 ; date of patent: Sep. 1, 1992 / assignee: Firma Carl Freudenberg},
  publisher = {[United States Patent and Trademark Office]},
  address   = {[Alexandria, VA]},
  pages     = {5 S. : Ill.},
  year      = {1992},
  language  = {en}
}
@article{Reissel1992,
  author    = {Reißel, Martin},
  title     = {On a transmission boundary-value problem for the time-harmonic Maxwell equations without displacement currents / Martin Reissel},
  pages     = {19 S.},
  year      = {1992},
  language  = {en}
}
@article{Grotendorst1992,
  author    = {Grotendorst, Johannes},
  title     = {Algorithms of mixed symbolic-numeric type for rational approximation},
  series = {Artificial intelligence, expert systems and symbolic computing : selected and revised papers from the IMACS 13th World Congress [on Computation and Applied Mathematics], Dublin, Ireland, July 1991 / ed. by Elias N. Houstis ...},
  journal   = {Artificial intelligence, expert systems and symbolic computing : selected and revised papers from the IMACS 13th World Congress [on Computation and Applied Mathematics], Dublin, Ireland, July 1991 / ed. by Elias N. Houstis ...},
  publisher = {North-Holland},
  address   = {Amsterdam},
  isbn      = {0-444-89703-8},
  pages     = {145 -- 154},
  year      = {1992},
  language  = {en}
}