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  2. 2
    by Freckmann, Karl
    published 1929
    Book
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  4. 4
    by Hempel, Eberhard
    published 1956
    Book
  5. 5
    published 2000
    Book
  6. 6
    by Hempel, Eberhard
    published 1955
    Full Text
    Book
  7. 7
  8. 8