1. Especies cripticas del genero Pleurodema que conviven en una misa area identificadas por el canto nupcial (Anura, Leptodactylidae);Barrio;Physis,1964
2. Electroferogrames de proteines seriques en el genero Bufo;Bertini,1959
3. Non-morphological data in anuran classification;Blair;Systematic Zool.,1962
4. An electrophoretic study of variation in the blood proteins of the toads Bufo americanus and Bufo woodhousei;Brown;Systematic Zool.,1964
5. A preliminary sypnosis of the genera of American microhylid frogs;de Carvalho;Occ. Pap. Mus. Zool. Univ. Michigan,1954