Silva, Eliane Ribeiro da, et al. “Nurseries for Tree Legumes Containing up to 80% Rock Phosphate - Preliminary Results”. Pesquisa Agropecuaria Brasileira, vol. 19, no. 13, Apr. 2014, pp. 283-91, doi:10.1590/S1678-3921.pab1984.v19.17579.