Martin F. Wojciechowski, Michael J. Sanderson, Jer-Ming Hu, Evidence on the Monophyly of Astragalus (Fabaceae) and its Major Subgroups Based on Nuclear Ribosomal DNA ITS and Chloroplast DNA trnL Intron Data, Systematic Botany, Vol. 24, No. 3 (Jul. - Sep., 1999), pp. 409-437
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Wojciechowski et al. (1999) studied this question.
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