Furtado, Rafael Nogueira, et al. “Nitrogen Balance and Ruminal Assessment in Male and Female Sheeps Fed Rations Containing Castor Cake under Different Treatments”. Semina: Ciências Agrárias, vol. 35, no. 6, Dec. 2014, pp. 3237-48, doi:10.5433/1679-0359.2014v35n6p3237.