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Sidor, C. A. and Rubidge, B. S. 2006. Herpetoskylax hopsoni, a New Biarmosuchian (Therapsida: Biarmosuchia) from the Beaufort Group of South Africa. Amniote Paleobiology: Perspectives on the Evolution of Mammals, Birds, and Reptiles. pp. 76-113. University of Chicago Press.