R. L. L. Berbara, L. R. Freire, and M. S. Fernandes, “Influence of arbuscular mycorrhiza fungi on the nutrition of okra plant”, PAB, vol. 34, no. 9, pp. 1645–1653, Sep. 1999, doi: 10.1590/S1678-3921.pab1999.v34.5408.