@unpublished{Radbruch1999,
  author  = {Knut Radbruch},
  title   = {Mathematische Spuren in der Philosophie},
  institution = {Fachbereich Mathematik},
  series    = {Preprints (rote Reihe) des Fachbereich Mathematik},
  number    = {307},
  year    = {1999},
  url  = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-7703},
}