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    published 1974
    Book
  3. 3
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    by Wilhelm, Pia
    published 1975
    Book
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    by Jendritzki, Hans
    published 1982
    Book
  7. 7
  8. 8
  9. 9
    by Wallenta, Wolfgang
    published 2017
    Book
  10. 10
  11. 11
    by Smith, Eric
    published 1983
    Book
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
    published 1974
    Book
  17. 17
  18. 18
  19. 19
    by Bergmann, Siegfried
    published 2012
    Book
  20. 20
    by Bergmann, Siegfried
    published 2012
    Book