Ying Chu, Elizabeth, et al. “Occurrence of Arbuscular <i>mycorrhizal fungi< i> and of <i>Azotobacter paspali< i> in <i>Paspalum notatum< I>”;. Pesquisa Agropecuaria Brasileira, vol. 33, no. 6, June 1998, pp. 1001-4, doi:10.1590/S1678-3921.pab1998.v33.4898.