@article{silva_oliveira_silva_silva_braga_2009,  title={Effect of cowpea intercropping on weed control and corn yieid},  volume={27},  ISSN={0100-8358},  url={https://doi.org/10.1590/S0100-83582009000300009},  DOI={10.1590/S0100-83582009000300009},  number={3},  journal={Planta Daninha},  publisher={Sociedade Brasileira da Ciência das Plantas Daninhas },  author={Silva, P.S.L. and Oliveira, O.F. and Silva, P.I.B. and Silva, K.M.B. and Braga, J.D.},  year={2009},  pages={491–497} }