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1Article of investigationPor Jaramillo Londoño, Hilda Norha; Caldas Zárate, Rafael; Díaz Hernández, Diana Patricia; Ortiz Uribe, ÁlvaroPublished in 1998Repositorio Repositorio UdeA
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2Article of investigationPor Pérez Giraldo, Jaime Alberto; Aristizábal Rivera, Juan Carlos; Ortiz Uribe, Álvaro; Jaramillo Londoño, Hilda NorhaPublished in 2009Repositorio Repositorio UdeA