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21Article of journalPublished in 1951Repositorio Universidad Nacional de Colombia
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22Article of journalPublished in 1968Repositorio Universidad Nacional de Colombia
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23Article of journalPublished in 1977Repositorio Universidad Nacional de Colombia
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24Article of journalPublished in 1964Repositorio Universidad Nacional de Colombia
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25Article of journalPublished in 1948Repositorio Universidad Nacional de Colombia
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26Article of journalPublished in 1970Repositorio Universidad Nacional de Colombia
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27Article of journalPublished in 1992Repositorio Universidad Nacional de Colombia
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28Article of journalPublished in 1964Repositorio Universidad Nacional de Colombia
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29Article of journalPublished in 1971Repositorio Universidad Nacional de Colombia
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30Article of journalPublished in 1983Repositorio Universidad Nacional de Colombia
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31Article of journalPublished in 1976Repositorio Universidad Nacional de Colombia
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32Article of journalPublished in 1944Repositorio Universidad Nacional de Colombia
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33Article of journalPublished in 1982Repositorio Universidad Nacional de Colombia
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34Article of journalPublished in 1947Repositorio Universidad Nacional de Colombia
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35Article of journalPublished in 1942Repositorio Universidad Nacional de Colombia
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36Article of journalPublished in 1944Repositorio Universidad Nacional de Colombia
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37Article of journalPublished in 1981Repositorio Universidad Nacional de Colombia
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38Article of journalPublished in 1969Repositorio Universidad Nacional de Colombia
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39Article of journalPublished in 1967Repositorio Universidad Nacional de Colombia
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40Article of journalPublished in 1943Repositorio Universidad Nacional de Colombia
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