E. L. Souchie, R. Azcón, J. M. Barea, O. J. Saggin-Júnior, and E. M. R. da Silva, “Phosphate solubilization and synergism between P-solubilizing and arbuscular mycorrhizal fungi”, PAB, vol. 41, no. 9, pp. 1405–1411, Sep. 2006.