Giacomini, Sandro José, et al. “Corn Utilization of Ammoniacal Nitrogen from Pig Slurry in No-Tillage and Reduced Tillage”. Pesquisa Agropecuaria Brasileira, vol. 44, no. 7, Nov. 2010, pp. 761-8, doi:10.1590/S1678-3921.pab2009.v44.2055.