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  1. OSMOTIC AND IONIC REGULATION IN LUMBRICUS TERRESTRIS L
    By: Dietz, Thomas H - Alvarado, Ronald H
    Type: Article
    In: Biol Bull
    Volume: 138
    Date: 1970-06-01
    Page Range: 247--261
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  2. Una especie nueva de Habranthus (Amaryllidaceae, Hippeastreae) para la Flora del Valle de Tehuacán-Cuicatlán
    By: Alvarado, Ronald H
    Type: Article
    In: Novon
    Volume: 18
    Date: 2008
    Page Range: 283--286
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