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1Article of investigationPor Arias Valencia, María Mercedes; Alcaraz López, Gloria Margarita; Bernal Parra, Carlos Alberto; González Echeverri, GermánPublished in 1997Repositorio Repositorio UdeA
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2Article of investigationPor Bernal Parra, Carlos Alberto; Alcaraz López, Gloria Margarita; Giraldo Barrera, Victor; Lopera Marín, Jhon; Botero López, Jorge EliécerPublished in 2004Repositorio Repositorio UdeA
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