Marra, L. M., P. H. Grazziotti, U. R. Nunes, and F. M. de S. Moreira. “Diazotrophic Bacteria in Star Flowers”. Bioscience Journal, vol. 28, no. 1, Mar. 2012, pp. 17-24, https://seer.ufu.br/index.php/biosciencejournal/article/view/12486.