Teuber K., N. and Elizalde V., H.F. 1999. Effect of forage conservation cut at different phenological stages of perennial ryegrass on the dynamic of ryegrass/white clover sward. Agro sur. 27, 1 (Jul. 1999), 94–104. DOI:https://doi.org/10.4206/agrosur.1999.v27n1-10.