@article{gomes_freire_1962,  title={Adubação da batatinha no vale do Paraíba experiências com adubos nitrogenados},  volume={21},  ISSN={0006-8705},  url={https://doi.org/10.1590/S0006-87051962000100014},  DOI={10.1590/S0006-87051962000100014},  number={unico},  journal={Bragantia},  publisher={Instituto Agronômico de Campinas},  author={Gomes, A. Gentil and Freire, E. S.},  year={1962},  pages={241–255} }