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  1. 21
    Published 1994
    Book
  2. 22
    Published 2000
    Book
  3. 23
  4. 24
    Published 2003
    Book
  5. 25
  6. 26
  7. 27
    Published 2003
    Book
  8. 28
  9. 29
    Published 2003
    Book
  10. 30
  11. 31
    Published 1997
    Book
  12. 32
    Published 1998
    Book
  13. 33
    Published 1998
    Book
  14. 34
  15. 35
  16. 36
  17. 37
    Published 1999
    Journal
  18. 38
    Published 1997
    Book
  19. 39
  20. 40
    Published 2001
    Book