Alejandro Gustavo Farji Brener, Adriana Ruggiero, Leaf-Cutting Ants (Atta and Acromyrmex) Inhabiting Argentina: Patterns in Species Richness and Geographical Range Sizes, Journal of Biogeography, Vol. 21, No. 4 (Jul., 1994), pp. 391-399
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Farji-Brener et al. (1994) studied this question.
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