Okuyama, Lauro Akio, and Luiz Osvaldo Colasante. “Root System Distribution of Upland Rice Cultivated in Dystrophic Dusky-Red Latosol”. Pesquisa Agropecuaria Brasileira, vol. 22, no. 8, Apr. 2014, pp. 803-7, doi:10.1590/S1678-3921.pab1987.v22.14868.