@misc{Koehler1999,
  author    = {K{\"o}hler, Sebastian},
  title     = {Kroker, A., Datenm{\"u}ll, die Theorie der virtuellen Klasse; Wien, Passagen-Verl., 1997},
  year      = {1999},
  language  = {de}
}
@misc{Koehler1999,
  author    = {K{\"o}hler, Sebastian},
  title     = {Innis, H. A., Kreuzwege der Kommunikation, ausgew{\"a}hlte Texte; Wien, Springer, 1997},
  year      = {1999},
  language  = {de}
}
@misc{Koehler1999,
  author    = {K{\"o}hler, Sebastian},
  title     = {Tiedemann, P., Internet f{\"u}r Philosophen: eine praxisorientierte Einf{\"u}hrung; Darmstadt, Primus, 1997},
  year      = {1999},
  language  = {de}
}
@misc{Koehler1999,
  author    = {K{\"o}hler, Sebastian},
  title     = {Winkler, H., Docuverse, zur Medientheorie der Computer; M{\"u}nchen, Boer, 1997},
  year      = {1999},
  language  = {de}
}