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  1. 1
    Open Access
    published 2012
    Full Text
    Full Text
    Electronic Journal
  2. 2
    Open Access
    published 1991
    Full Text
    Full Text
    Electronic Journal
  3. 3
    online resource
    published 1989
    EZB
    Read me
    Volltext
    Electronic Journal
  4. 4
    Open Access
    published 1976
    Full Text
    Full Text
    Electronic Journal
  5. 5
    Open Access
    published 1963
    Full Text
    Full Text
    Electronic Journal
  6. 6
    Open Access
  7. 7
    Open Access
    published 1958
    Full Text
    Full Text
    Electronic Journal