Juan J. Morrone, David Espinosa Organista, , Jorge Llorente Bousquets, Preliminary Classification of the Mexican Biogeographic Provinces: A Parsimony Analysis of Endemicity Based on Plant, Insect, and Bird Taxa, The Southwestern Naturalist, Vol. 44, No. 4 (Dec., 1999), pp. 507-514
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Morrone et al. (1999) studied this question.