@article{JonasLanger1993,
  author    = {Jonas, Peter and Langer, Heinz},
  title     = {Selfadjoint extensions of a closed linear relation of defect one in a Krein space},
  year      = {1993},
  language  = {en}
}
@article{LouisMaass1993,
  author    = {Louis, Alfred K. and Maaß, Peter},
  title     = {Contour reconstructions for 3D X-Ray CT-Images},
  year      = {1993},
  language  = {en}
}
@misc{Quaisser1993,
  author    = {Quaisser, Erhard},
  title     = {Bonetti, F., Civolani, N., Centro Stampa Univ. degli Studi di Perugia, (1993), S. 113 - 131},
  year      = {1993},
  language  = {it}
}
@misc{Quaisser1993,
  author    = {Quaisser, Erhard},
  title     = {Steinke, G. F., Geometriae Dedicata, 48 (1993), S. 337 - 348},
  year      = {1993},
  language  = {de}
}
@misc{Quaisser1993,
  author    = {Quaisser, Erhard},
  title     = {Strambach, K., Centro Stampa Univ. degli Studi di Perugia, (1993), S. 21 - 24},
  year      = {1993},
  language  = {it}
}
@misc{Quaisser1993,
  author    = {Quaisser, Erhard},
  title     = {Kainen, P. C., Geombinatorics, 3 (1993), 1, S. 10 - 12},
  year      = {1993},
  language  = {de}
}
@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}
}
@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{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{Baumgaertel1993,
  author    = {Baumg{\"a}rtel, Hellmut},
  title     = {Operatoralgebren und Quantenfeldtheorie},
  series = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  volume    = {1993, 12},
  journal   = {Preprint / Universit{\"a}t Potsdam, Fachbereich Mathematik},
  publisher = {Univ.},
  address   = {Potsdam},
  pages     = {11 Bl.},
  year      = {1993},
  language  = {de}
}