@article{viégas_freire_fraga jr._1960,  title={Adubação do milho: XIV - Ensaios com mucuna intercalada e adubos minerais},  volume={19},  ISSN={0006-8705},  url={https://doi.org/10.1590/S0006-87051960000100057},  DOI={10.1590/S0006-87051960000100057},  number={unico},  journal={Bragantia},  publisher={Instituto Agronômico de Campinas},  author={Viégas, G. P. and Freire, E. S. and Fraga Jr., C. G.},  year={1960},  pages={909–941} }