Diel, Debora, et al. “Phosphorus Horizontal and Vertical Distribution in Single Soybean Crop and in Integrated crop‑livestock‑forest Systems”. Pesquisa Agropecuaria Brasileira, vol. 49, no. 8, Aug. 2014, pp. 639-47, doi:10.1590/S1678-3921.pab2014.v49.19035.