A. Casas, D. Cianzio, A. Rivera, M. Antoni, L. Añeses, and L. Cantisani, “The effect of stocking rate, fertilizer level and winter supplementation on the grazing performance of Senepol purebred and crossbred bulls”, JAUPR, vol. 84, no. 1-2, pp. 1–15, Apr. 2000.