Pitrat, C. W., 1973, Vertebrates and the Permo-Triassic extinction: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 14, p. 249-264.
Schopf, T. J. M., 1974, Permo-Triassic extinctions: relations to sea floor spreading: Journal of Geology, v. 82, p. 129-143.
Simberloff, D. S., 1974, Permo-Triassic extinctions: effects of area on biotic equilibrium: Journal of Geology, v. 82, p. 267-274.
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