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1Article of journalPublished in 2011Repositorio Repositorio Institucional U. Caldas
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4Article of journalPublished in 2011Repositorio Repositorio U. de Caldas
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5Article of journalPublished in 2011Repositorio Repositorio U. de Caldas
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6Article of journalPublished in 2011Repositorio Repositorio Institucional U. Caldas
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