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  1. 1
    by Kühnel, Ernst
    published 1925
    Book
  2. 2
    published 1991
    Book
  3. 3
    published 1991
    Book
  4. 4
    published 1991
    Book
  5. 5
    published 1923
    Book
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
    published 2008
    Book
  12. 12
    published 1989
    Book Conference Proceedings