Carvalho, Arminda, Robélio Marchão, Mercedes Maria Bustamante, Flávia Alcântara, e Thais Coser. 2014. “Characterization of Cover Crops by NMR Spectroscopy: Impacts on Soil Carbon, Nitrogen and Phosphorus under Tillage Regimes”. Revista Ciência Agronômica 45 (5). https://periodicos.ufc.br/revistacienciaagronomica/article/view/84529.