@article{nunes_passaglia_schrank_schrank_2000,  title={Directed mutagenesis affects recombination in Azospirillum brasilense nif genes},  volume={23},  ISSN={1415-4757},  url={https://doi.org/10.1590/S1415-47572000000400032},  DOI={10.1590/S1415-47572000000400032},  number={4},  journal={Genetics and Molecular Biology},  publisher={Sociedade Brasileira de Genética},  author={Nunes, C.P. and Passaglia, L.M.P. and Schrank, A. and Schrank, I.S.},  year={2000},  month={Dec},  pages={901–905} }