Giacomini, Sandro José, and Celso Aita. “Carbon Dioxide Emission After Application of Pig Slurry and Pig Deep-Litter”. Pesquisa Agropecuaria Brasileira, vol. 43, no. 1, Jan. 2008, pp. 107-14, doi:10.1590/S1678-3921.pab2008.v43.7966.