Prado, Ivanor Nunes do, et al. “Apparent Digestibility and Nitrogen Balance of Preruminant Kids Fed With cow’s Milk or Soybean Protein”. Pesquisa Agropecuaria Brasileira, vol. 28, no. 8, Feb. 2012, pp. 969-75, doi:10.1590/S1678-3921.pab1993.v28.3323.