Azevedo, Watson Rogério de, et al. “Boron Adsorption in Lowland Soils from Southern of the State of Minas Gerais, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 36, no. 7, July 2001, pp. 957-64, doi:10.1590/S1678-3921.pab2001.v36.6218.