Barbara A. Whitlock, David A. Baum, Phylogenetic Relationships of Theobroma and Herrania (Sterculiaceae) Based on Sequences of the Nuclear Gene Vicilin, Systematic Botany, Vol. 24, No. 2 (Apr. - Jun., 1999), pp. 128-138
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Whitlock et al. (1999) studied this question.
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