Primavesi, Ana Cândida, et al. “Cations and Anions Uptake by Coastcross Grass Fertilized With Urea and Ammonium Nitrate”. Pesquisa Agropecuaria Brasileira, vol. 40, no. 3, Mar. 2005, pp. 247-53, doi:10.1590/S1678-3921.pab2005.v40.6951.