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  1. 1
    published 1973
    Frontdoor-Url
    Verlag
    Electronic Journal
  2. 2
    published 1991
    Frontdoor-Url
    Verlag
    Electronic Journal
  3. 3
    published 2005
    Full Text
    E-Book
  4. 4
    published 2006
    Full Text
    Inhaltsverzeichnis
    E-Book