@article{perin_santos_urquiaga_cecon_guerra_freitas_2006,  title={Sunnhemp and millet as green manure for tropical maize production},  volume={63},  ISSN={0103-9016},  url={https://doi.org/10.1590/S0103-90162006000500006},  DOI={10.1590/S0103-90162006000500006},  number={5},  journal={Scientia Agricola},  publisher={Escola Superior de Agricultura "Luiz de Queiroz"},  author={Perin, Adriano and Santos, Ricardo Henrique Silva and Urquiaga, Segundo Sacramento and Cecon, Paulo Roberto and Guerra, José Guilherme Marinho and Freitas, Gilberto Bernardo de},  year={2006},  month={Sep},  pages={453–459} }