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Crawford DJ, Ruiz E, Stuessy TF, Tepe E, Aqeveque P, Gonzalez F, Jensen RJ, Anderson GJ, Bernardello G, Baeza CM, Swenson U, Silva O M.Crawford DJ, et al.Am J Bot. 2001 Dec;88(12):2195-203.Am J Bot. 2001.PMID: 21669652Free article.
Sang T, Crawford DJ, Stuessy TF.Sang T, et al. Among authors: crawford dj.Proc Natl Acad Sci U S A. 1995 Jul 18;92(15):6813-7. doi: 10.1073/pnas.92.15.6813.Proc Natl Acad Sci U S A. 1995.PMID: 7624325Free PMC article.