Nunes, Marcos R., et al. “Effect of Land Disposal of Stillage on Exchangeable Cations and Other Nutrients in the Soil”. Pesquisa Agropecuaria Brasileira, vol. 16, no. 2, Apr. 2014, pp. 171-6, doi:10.1590/S1678-3921.pab1981.v16.16768.