@proceedings{Wille89e,
  address = { Frankfurt },
  editor = {Wille, Rudolf},
  interhash = {6f86c57261e77d642732daadc86de9e3},
  intrahash = {ed920b6cf80c1685e26e0966c039dada},
  publisher = { Indeks--Verlag },
  title = { Klassifikation und Ordnung },
  year = { 1989 }
}