@book{WesterheideGarus1985,
  author    = {Westerheide, Peter and Garus, Guntram},
  title     = {Differential- und Integralrechnung},
  edition   = {1. Aufl.},
  publisher = {Hanser},
  address   = {M{\"u}nchen [u.a.]},
  isbn      = {3-446-13038-1},
  pages     = {250 S. : graph. Darst.},
  year      = {1985},
  language  = {de}
}
@book{SchauweckerLane1985,
  author    = {Schauwecker, Hans-Peter and Lane, Roland},
  title     = {Einf{\"u}hrung in das deutsche und englische Wirtschaftsrecht},
  edition   = {1. Aufl.},
  publisher = {Inst. f{\"u}r Europ. Wirtschafts- u. Steuerrecht},
  address   = {Basel},
  isbn      = {3-906512-00-2},
  pages     = {XI S., 76 Bl. (zweiseitig bedr},
  year      = {1985},
  language  = {de}
}
@book{Westerheide1985,
  author    = {Westerheide, Peter},
  title     = {Differential- und Integralrechnung (Analysis)},
  publisher = {Hanser-Verlag},
  address   = {M{\"u}nchen},
  isbn      = {3-446-13038-1},
  year      = {1985},
  language  = {de}
}