D’Avila Lima H. J., Bareto S. L., Donzele J. L., Tinoco I. F., and Ribas N. S. “Ideal Ratio of Digestible Methionine Plus Cystine to Digestible Lysine for Growing Japanese Quails”. Revista Colombiana De Ciencias Pecuarias, Vol. 28, no. 4, Oct. 2015, pp. 313-22, https://revistas.udea.edu.co/index.php/rccp/article/view/324937.