Gabriel Octávio de Mello Cunha, Jaime Antonio de Almeida, Paulo Roberto Ernani, Éderson Rodrigues Pereira and Gustavo Brunetto (2018) “Composition, chemical speciation and activity of ions in the solution of Brazilian acid soils”, Brazilian Journal of Agricultural Sciences, 13(3), pp. 1-10. doi: 10.5039/agraria.v13i3a5542.