@book{FassbenderVogler1992,
  author    = {Faßbender, Heinz and Vogler, Heiko},
  title     = {A universal unification algorithm based on unification driven leftmost outermost narrowing},
  publisher = {Univ. Ulm, Fak. f{\"u}r Informatik},
  address   = {Ulm},
  pages     = {47 S. : graph. Darst.},
  year      = {1992},
  language  = {en}
}
@article{HeuermannSchiek1992,
  author    = {Heuermann, Holger and Schiek, Burkhard},
  title     = {A Generalization of the Txx Network Analyzer Self-Calibration Procedure},
  series = {Conference proceedings : monday 24th to thursday 27th august 1992, Helsinki University of Technology, Espoo, Finland ; [the international conference and exhibition designed for the Microwave Community]. Vol. 2},
  journal   = {Conference proceedings : monday 24th to thursday 27th august 1992, Helsinki University of Technology, Espoo, Finland ; [the international conference and exhibition designed for the Microwave Community]. Vol. 2},
  publisher = {Microwave Exhibitions and Publishers},
  address   = {Tunbridge Wells},
  isbn      = {0-946821-77-1},
  pages     = {907 -- 912},
  year      = {1992},
  language  = {en}
}
@article{HeuermannSchiek1992,
  author    = {Heuermann, Holger and Schiek, Burkhard},
  title     = {A Fast and Robust Procedure for the Determination of the Scattering Parameters for Network Analyzer Calibration},
  address   = {Paris},
  pages     = {373 -- 374},
  year      = {1992},
  language  = {en}
}