A. B. da Silva, C. A. B. Carvalho, C. de A. Pires, J. C. de C. Almeida, and D. de D. Nepomuceno, “Effects of nitrogen dosage and urea source on morphological composition and forage accumulation in massai grass”, Sem. Ci. Agr., vol. 39, no. 4, pp. 1407–1416, Aug. 2018.