I. C. O. Rojas, A. E. Murakami, J. C. Fanhani, K. P. Picoli, e M. J. B. Barbosa, “Tryptophan, threonine and isoleucine supplementation in low-protein diets for commercial laying hens”, Sem. Ci. Agr., vol. 36, nº 3, p. 1735–1744, jun. 2015.