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  1. 59721
    Article of journal
    Published in 1996
    Repositorio Universidad Nacional de Colombia

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  2. 59722
  3. 59723
    Article of journal
    Published in 1981
    Repositorio Universidad Nacional de Colombia

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    Get full text
  4. 59724
  5. 59725
  6. 59726
  7. 59727
    Work document
    Published in 2007
    Repositorio Universidad Nacional de Colombia

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  8. 59728
  9. 59729
  10. 59730
  11. 59731
  12. 59732
  13. 59733
  14. 59734
  15. 59735
  16. 59736
  17. 59737
  18. 59738
  19. 59739
  20. 59740