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  1. By: Parra, O O - Rivera, P R - Floyd, G L - Wilcox, L W
    Type: Article
    In: Gayana.
    Volume: 48
    Issue: 1-4
    Date: 1991
    Page Range: 101--110
    Publication info: [Concepción] Chile :Instituto Central de Biología, Universidad de Concepción,1961-