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semanticscholar.org
api.semanticscholar.org
Mackie, J.L. (1978). "The Law of the Jungle: Moral Alternatives and Principles of Evolution". Philosophy. 53 (206): 455–464. doi:10.1017/S0031819100026322. S2CID159925034.
ssrn.com
Lamey 2010, p. 172; for similarities between Midley and Coetzee, see pp. 175–181