@book{BattagliaMayerSchmidt1993,
  author    = {Battaglia Mayer, Alexandra and Schmidt, Hans-J{\"u}rgen},
  title     = {The de Sitter space-time as attractor solution in eighth order gravity},
  series = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  volume    = {1993, 05},
  journal   = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {9 S.},
  year      = {1993},
  language  = {en}
}
@book{Baumgaertel1993,
  author    = {Baumg{\"a}rtel, Hellmut},
  title     = {Some operatoralgebraic fundamentals of the algebraic quantum field theory},
  series = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  volume    = {1993, 09},
  journal   = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {43 Bl.},
  year      = {1993},
  language  = {en}
}
@book{Rainer1993,
  author    = {Rainer, Martin},
  title     = {Orientation duality of 4-dimensional real Lie algebras},
  series = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  volume    = {1993, 08},
  journal   = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {23 Bl.},
  year      = {1993},
  language  = {en}
}
@book{OPUS4-28852,
  title     = {General algebra and applications},
  series = {Research and exposition in mathematics},
  volume    = {20},
  journal   = {Research and exposition in mathematics},
  editor    = {Denecke, Klaus-Dieter},
  publisher = {Heldermann},
  address   = {Berlin},
  isbn      = {3-88538-220-2},
  pages     = {237 S. : Ill.},
  year      = {1993},
  language  = {en}
}
@book{Schmidt1993,
  author    = {Schmidt, Hans-J{\"u}rgen},
  title     = {Comment to a paper by J. Simon in Phys. Rev. D 45 (1992) 1953},
  series = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  volume    = {1993, 06},
  journal   = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {23 Bl.},
  year      = {1993},
  language  = {en}
}