Machado, W. C., & Döbereiner, J. (2014). Further studies on the physiology of Azotobacter paspali and its dependence on the plant (Paspalum notatum). Pesquisa Agropecuaria Brasileira, 4(1), 53-58. https://doi.org/10.1590/S1678-3921.pab1969.v4.17777