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    published 1974
    Book
  4. 4
  5. 5
    by Wilhelm, Pia
    published 1975
    Book
  6. 6
    published 1982
    Book Conference Proceedings
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
    by Wallenta, Wolfgang
    published 2017
    Book
  12. 12
    published 1992
    Book
  13. 13
  14. 14
    published 2001
    Book
  15. 15
    published 1985
    Book
  16. 16
  17. 17
  18. 18
  19. 19
  20. 20
    published 1974
    Book