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  1. By: Valenzuela, Ariel - Oyarzún, Ciro - Silva, Víctor
    Type: Article
    In: Gayana (Concepción)
    Date: 2003-01-01
  2. By: Silva, Víctor - Valenzuela, Ariel - Ruiz, Paulo - Oyarzún, Ciro
    Type: Article
    In: Gayana (Concepción)
    Date: 2005-01-01