@article{kober_sá_freire_giongo_2004,  title={Characterization of variants of Bradyrhizobium elkanii and B. japonicum and symbiotic behaviour in soybeans},  volume={34},  ISSN={0103-8478},  url={https://doi.org/10.1590/S0103-84782004000500020},  DOI={10.1590/S0103-84782004000500020},  number={5},  journal={Ciência Rural},  publisher={Universidade Federal de Santa Maria},  author={Kober, Marcia de Vargas and Sá, Enilson Luiz Saccol de and Freire, João Ruy Jardim and Giongo, Adriana},  year={2004},  month={Sep},  pages={1459–1464} }