Jeff J. Doyle, Jane L. Doyle, A. H. D. Brown, A Chloroplast-DNA Phylogeny of the Wild Perennial Relatives of Soybean (Glycine Subgenus glycine): Congruence with Morphological and Crossing Groups, Evolution, Vol. 44, No. 2 (Mar., 1990), pp. 371-389
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Doyle et al. (1990) studied this question.
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