C. G. S. Benett, S. Buzetti, K. S. Silva, M. C. M. Teixeira Filho, M. Andreotti, and O. Arf, “Leaf and sidedressing nitrogen application on wheat crop in savanna”, Semina: Ciênc. Agrár., vol. 32, no. 3, pp. 829–838, Aug. 2011.