@incollection{Petsche2016,
  author    = {Petsche, Hans-Joachim},
  title     = {Grenzen als philosophisches Problem},
  series = {Grenzen im Fokus der Wissenschaften},
  booktitle = {Grenzen im Fokus der Wissenschaften},
  publisher = {Trafo},
  address   = {Berlin},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {23 -- 67},
  year      = {2016},
  language  = {de}
}
@incollection{Petsche2016,
  author    = {Petsche, Hans-Joachim},
  title     = {Einf{\"u}hrung},
  series = {Grenzen im Fokus der Wissenschaften},
  booktitle = {Grenzen im Fokus der Wissenschaften},
  publisher = {Trafo},
  address   = {Berlin},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {9 -- 21},
  year      = {2016},
  language  = {de}
}