E. André Ferreira, J. Gonçalves de Abreu, J. Cesar Martinez, T. Gomes dos Santos Braz, and D. Paulo Ferreira, “Cutting ages of elephant grass for chopped hay production”, Pesq. Agropec. Trop., vol. 48, no. 3, pp. 245–253, Jul. 2018, doi: 10.5216/pat.v48i3.51569.