Llewellyn D. Densmore III, Craig C. Moritz, John W. Wright, Wesley M. Brown, Mitochondrial-DNA Analyses and the Origin and Relative Age of Parthenogenetic Lizards (Genus cnemidophorus). IV. Nine Sexlineatus-Group Unisexuals, Evolution, Vol. 43, No. 5 (Aug., 1989), pp. 969-983
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Densmore et al. (1989) studied this question.
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