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21Article of journalPublished in 1999Repositorio Universidad Nacional de Colombia
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22Article of journalPublished in 1970Repositorio Universidad Nacional de Colombia
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23Article of journalPublished in 1976Repositorio Universidad Nacional de Colombia
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24Article of journalPublished in 1967Repositorio Universidad Nacional de Colombia
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25Article of journalPublished in 1968Repositorio Universidad Nacional de Colombia
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26Article of journalPublished in 1990Repositorio Universidad Nacional de Colombia
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27Article of journalPublished in 1982Repositorio Universidad Nacional de Colombia
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28Article of journalPublished in 1974Repositorio Universidad Nacional de Colombia
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29Article of journalPublished in 1978Repositorio Universidad Nacional de Colombia
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30Article of journalPublished in 1984Repositorio Universidad Nacional de Colombia
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31Article of journalPublished in 1975Repositorio Universidad Nacional de Colombia
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32Article of journalPublished in 1979Repositorio Universidad Nacional de Colombia
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33Article of journalPublished in 1979Repositorio Universidad Nacional de Colombia
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34Article of journalPublished in 1993Repositorio Universidad Nacional de Colombia
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35Article of journalPublished in 1974Repositorio Universidad Nacional de Colombia
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36Article of journalPublished in 1980Repositorio Universidad Nacional de Colombia
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37Article of journalPublished in 1996Repositorio Universidad Nacional de Colombia
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38Article of journalPublished in 1986Repositorio Universidad Nacional de Colombia
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39Article of journalPublished in 1997Repositorio Universidad Nacional de Colombia
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40Article of journalPublished in 1981Repositorio Universidad Nacional de Colombia
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