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  2. 2
    published 1990
    Book
  3. 3
  4. 4
  5. 5
    published 1924
    Book
  6. 6
    published 1924
    Book
  7. 7
    published 1971
    Book
  8. 8
    published 1994
    Book Conference Proceedings
  9. 9
    published 1947
    Book
  10. 10
  11. 11
  12. 12
  13. 13
    published 1973
    Book
  14. 14
  15. 15
    by Hackenbroch, Yvonne
    published 1938
    Book Thesis
  16. 16
  17. 17
  18. 18
    by Haenel, Erich
    published 1913
    Book
  19. 19
  20. 20