Macari, Stefani, et al. “Rearing of Lambs under Different Grazing Methods on Annual Ryegrass in Succession to Crops”. Pesquisa Agropecuaria Brasileira, vol. 46, no. 10, Jan. 2012, pp. 1401-8, doi:10.1590/S1678-3921.pab2011.v46.9063.