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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Rivera, P S - Barrales P., Hugo.
    Type: Article
    In: Gayana
    Volume: 46
    Date: 1989
    Page Range: 213--218
    Publication Info: [Concepción] Chile, Instituto Central de Biología, Universidad de Concepción, 1961-
  2. By: Rivera, P S - Gebauer Hernández, Marlene Gloria - Barrales P., Hugo.
    Type: Article
    In: Gayana
    Volume: 46
    Issue: 3-4
    Date: 1989
    Page Range: 155--198
    Publication Info: [Concepción] Chile, Instituto Central de Biología, Universidad de Concepción, 1961-
  3. By: Rivera R., Patricio. - Barrales P., Hugo.
    Type: Article
    In: Gayana
    Volume: 56
    Date: 1999
    Page Range: 87--91
    Publication Info: [Concepción] Chile, Instituto Central de Biología, Universidad de Concepción, 1961-