Araújo, Ednaldo da Silva, et al. “Comparison of 15N Isotope Methods to Determine the Recovery Efficiency of Nitrogen from Green Manure”. Pesquisa Agropecuaria Brasileira, vol. 54, no. X, Oct. 2019, p. e00721, doi:10.1590/S1678-3921.pab2019.v54.26599.