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Jack A. Wolfe, James A. Doyle, Virginia M. Page, The Bases of Angiosperm Phylogeny: Paleobotany, Annals of the Missouri Botanical Garden, Vol. 62, No. 3, The Bases of Angiosperm Phylogeny (1975), pp. 801-824
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Wolfe et al. (1975) studied this question.
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