Morais, José Francisco Valente, et al. “Nitrogen Transformations in Two Rice Soils of Rio Grande Do Sul under Submerged Conditions”. Pesquisa Agropecuaria Brasileira, vol. 10, no. 11, Apr. 2014, pp. 25-30, doi:10.1590/S1678-3921.pab1975.v10.17102.