Cifelli, R. L. (1983). The origin and affinities of the South American Condylarthra and Early Tertiary Litopterna (Mammalia). American Museum Novitates. 2772: 1-49.
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Cifelli, R. L.
1983
The origin and affinities of the South American Condylarthra and Early Tertiary Litopterna (Mammalia)