Sanzonowicz, Cláudio, and Walter Couto. “Effect of Calcium, Sulphur and Other Nutrients on Dry Matter Yield and Nodulation of Leucaena Leucocephala in ‘Cerrado’ Soil”. Pesquisa Agropecuaria Brasileira, vol. 16, no. 6, Apr. 2014, pp. 789-94, doi:10.1590/S1678-3921.pab1981.v16.17108.