Mendonça, Renilton Joaquim de, et al. “Rice Cultivars Ability to Change Nutrient Solution PH in the Presence of Aluminum”. Pesquisa Agropecuaria Brasileira, vol. 40, no. 5, May 2005, pp. 447-52, doi:10.1590/S1678-3921.pab2005.v40.6977.