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