@misc{Koeppen2017,
  author    = {Paul K{\"o}ppen},
  title     = {Weil nicht wahr sein kann, was nicht wahr sein darf},
  booktitle = {Postprints der Universit{\"a}t Potsdam : Philosophische Reihe},
  number    = {130},
  issn      = {1866-8380},
  institution = {Historisches Institut},
  series    = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Philosophische Reihe},
  number    = {130},
  type      = {postprint},
  pages     = {11},
  year        = {2017},
}