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Miller, « The structure of species, outcomes of speciation and the 'species problem': Ideas for paleobiology », Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 176, no 1, , p. 1–10 (DOI10.1016/S0031-0182(01)00346-7, Bibcode2001PPP...176....1M)
Bernstein, H.; Byerly, H.C.; Hopf, F.A.; Michod, Richard E., « Sex and the emergence of species », J. Theor. Biol., vol. 117, no 4, , p. 665–90 (PMID4094459, DOI10.1016/S0022-5193(85)80246-0)