Souchie, Edson Luiz, et al. “Phosphate Solubilization in Solid and Liquid Media by Soil Bacteria and Fungi”. Pesquisa Agropecuaria Brasileira, vol. 40, no. 11, Nov. 2005, pp. 1149-52, doi:10.1590/S1678-3921.pab2005.v40.7078.