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41Article of journalPublished in 1973Repositorio Universidad Nacional de Colombia
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42Article of journalPublished in 1986Repositorio Universidad Nacional de Colombia
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43Article of journalPublished in 1979Repositorio Universidad Nacional de Colombia
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44Article of journalPublished in 1981Repositorio Universidad Nacional de Colombia
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45Article of journalPublished in 1998Repositorio Universidad Nacional de Colombia
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46Article of journalPublished in 1990Repositorio Universidad Nacional de Colombia
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47Article of journalPublished in 1979Repositorio Universidad Nacional de Colombia
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48Article of journalPublished in 1974Repositorio Universidad Nacional de Colombia
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49Article of journalPublished in 2002Repositorio Universidad Nacional de Colombia
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50Article of journalPublished in 1973Repositorio Universidad Nacional de Colombia
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51Article of journalPublished in 1980Repositorio Universidad Nacional de Colombia
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52Article of journalPublished in 1972Repositorio Universidad Nacional de Colombia
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53Article of journalPublished in 1968Repositorio Universidad Nacional de Colombia
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54Article of journalPublished in 1989Repositorio Universidad Nacional de Colombia
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55Article of journalPublished in 1994Repositorio Universidad Nacional de Colombia
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56Article of journalPublished in 1986Repositorio Universidad Nacional de Colombia
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57Article of journalPublished in 1985Repositorio Universidad Nacional de Colombia
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58Article of journalPublished in 1991Repositorio Universidad Nacional de Colombia
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59Article of journalPublished in 1995Repositorio Universidad Nacional de Colombia
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60Article of journalPublished in 1970Repositorio Universidad Nacional de Colombia
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