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  1. By: Campos, H - Steffen, W - Parra, Antonio - Dominguez, P - Aguero, G
    Type: Article
    In: Gayana.
    Volume: 44
    Date: 1987
    Page Range: 61--84
    Publication info: [Concepción] Chile :Instituto Central de Biología, Universidad de Concepción,1961-