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Sennikov, A.G. (1996). "Evolution of the Permian and Triassic tetrapod communities of Eastern Europe". Palaeogeography, Palaeoclimatology, Palaeoecology. 120 (3): 331–351. Bibcode:1996PPP...120..331S. doi:10.1016/0031-0182(95)00041-0.