C. Aita, S. J. Giacomini, and A. P. Hübner, “Nitrification of ammoniacal nitrogen from pig slurry in soil under no-tillage”, PAB, vol. 42, no. 1, pp. 95–102, Jan. 2007, doi: 10.1590/S1678-3921.pab2007.v42.7540.