Azevedo, Aristéa Alves, and Marco Antonio Oliva. “Effect of Aluminum on Productivity and Mineral Elements in Soybean”. Pesquisa Agropecuaria Brasileira, vol. 24, no. 12, Apr. 2014, pp. 1537-46, doi:10.1590/S1678-3921.pab1989.v24.16636.