Zhu et al., 1996. Agron. J., 88 (6): 955-960 Document reference Zhu, Y.; Sheaffer, C. C.; Barnes, D. K., 1996. Forage yield and quality of six annual Medicago species in the North-Central USA. Agron. J., 88 (6): 955-960Web https://doi.org/10.2134/agronj1996.00021962003600060019xCitation key Zhu et al., 1996Datasheets Bur clover (Medicago polymorpha)
