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1Article of investigationPublished in 2007Repositorio Repositorio Institucional ECI
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2Article of investigationPublished in 2006Repositorio Repositorio Institucional ECI
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3Article of investigationPublished in 2007Repositorio Repositorio Institucional ECI
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5Article of investigationPor Aperador Chaparro, William Arnulfo; Vera López, Enrique; Camargo López , Edwin Ariel; Laverde, Dionisio; Guerrero, John Wilver; Mora Parada, José Manuel; Álvarez, Miguel ÁngelPublished in 2006Repositorio Repositorio Institucional ECI