@article{burity_chamber-perez_lyra_figueiredo_1999,  title={Nitrate levels and stages of growth in hypernodulating mutants of Lupinus albus. I. N2 fixation potential},  volume={30},  ISSN={0001-3714},  url={https://doi.org/10.1590/S0001-37141999000200001},  DOI={10.1590/S0001-37141999000200001},  number={2},  journal={Revista de Microbiologia},  publisher={Sociedade Brasileira de Microbiologia},  author={Burity, Hélio Almeida and Chamber-Perez, Manuel and Lyra, Maria do Carmo Catanho Pereira de and Figueiredo, Márcia do Vale Barreto},  year={1999},  month={Apr},  pages={91–97} }