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  1. 1
  2. 2
  3. 3
    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
    by Bechler, Katharina
    published 2003
    Book
  14. 14
  15. 15
    published 1985
    Book
  16. 16
    by John, Michael
    published 2006
    Book Special Print
  17. 17
  18. 18
  19. 19
  20. 20