Casagrande, J.C. and Souza, O.C. de 2014. Effect of sulphur levels on four tropical grasses in "Cerrado" soils of "Mato Grosso do Sul", Brazil. Pesquisa Agropecuaria Brasileira. 17, 1 (Apr. 2014), 21–25. DOI:https://doi.org/10.1590/S1678-3921.pab1982.v17.15509.