Favoretto, Vanildo, et al. “Nitrogen Application in Soil and Foliar Spray With Urea and Gibberelic Acid in Setária Anceps Stapf Cv. Kazungula”. Pesquisa Agropecuaria Brasileira, vol. 19, no. 1, Apr. 2014, pp. 21-28, https://doi.org/10.1590/S1678-3921.pab1984.v19.15293.