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, Gustavo Casas, Scott K. Davis, Guillermo Lara, Jack W. Sites, Jr., Parapatric Hybridization between Chromosome Races of the Sceloporus grammicus Complex (Phrynosomatidae): Structure of the Ajusco Transect, Copeia, Vol. 1993, No. 2 (May 3, 1993), pp. 352-372
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Arévalo et al. (1993) studied this question.
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