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3. Ontogeny of a new Palaeogene pipid frog from southern South America and xenopodinomorph evolution;Báez;Zool J Linn Soc,2003
4. Redescription of the Paleogene Shelania pascuali from Patagonia and its bearing on the relationships of fossil and Recent pipid frogs;Báez;Sci Pap Univ Kansas Nat Hist Mus,1997