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Grass Phylogeny Working Group, Nigel P. Barker, Lynn G. Clark, Jerrold I. Davis, Melvin R. Duvall, Gerald F. Guala, Catherine Hsiao, Elizabeth A. Kellogg, H. Peter Linder, Roberta J. Mason-Gamer, Sarah Y. Mathews, Mark P. Simmons, Robert J. Soreng, Russell E. Spangler, Phylogeny and Subfamilial Classification of the Grasses (Poaceae), Annals of the Missouri Botanical Garden, Vol. 88, No. 3 (Summer, 2001), pp. 373-457
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Group et al. (2001) studied this question.
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