@incollection{Wille84b,
  address = { Frankfurt },
  author = {Wille, Rudolf},
  booktitle = { Anwendungen der Klassifikation: Datenanalyse
      und numerische Klassifikation },
  editor = {Bock, Hans-Herrmann},
  interhash = {aa5a5474c0a4387314c7d0148e4478c9},
  intrahash = {82d6c7fb9250e96c1d23ecc76344368b},
  note = { Line diagrams of hierarchical concept systems (engl.\
        {\"U}bersetzung). {\em Int. Classif.} {\bf 11} (1984), 77--86 },
  pages = { 32-51 },
  publisher = { Indeks--Verlag },
  title = { Liniendiagramme hierarchischer Begriffssysteme },
  year = { 1984 }
}