Silveira, Edson Roberto, et al. “Grazing Intensity and Nitrogen in Oat Dry Mass and Yield of Corn Crop Livestock Systems”. Semina: Ciências Agrárias, vol. 33, no. 4, Aug. 2012, pp. 1323-32, doi:10.5433/1679-0359.2012v33n4p1323.