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Integration of morphological and ribosomal RNA data reveals insights on angiosperm origins, suggesting connections between features and evolutionary pathways.
James A. Doyle, Michael J. Donoghue, Elizabeth A. Zimmer, Integration of Morphological and Ribosomal RNA Data on the Origin of Angiosperms, Annals of the Missouri Botanical Garden, Vol. 81, No. 3 (1994), pp. 419-450
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Doyle et al. (1994) studied this question.
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