@article{luca_hungría_2014,  title={Plant densities and modulation of symbiotic nitrogen fixation in soybean},  volume={71},  ISSN={0103-9016},  url={https://doi.org/10.1590/S0103-90162014000300002},  DOI={10.1590/S0103-90162014000300002},  number={3},  journal={Scientia Agricola},  publisher={Escola Superior de Agricultura "Luiz de Queiroz"},  author={Luca, Marcos Javier de and Hungría, Mariangela},  year={2014},  month={May},  pages={181–187} }