@article{carvalho_alves_bianco_2013,  title={Sourgrass densities affecting the initial growth and macronutrient content of coffee plants},  volume={31},  ISSN={0100-8358},  url={https://doi.org/10.1590/S0100-83582013000100012},  DOI={10.1590/S0100-83582013000100012},  number={1},  journal={Planta Daninha},  publisher={Sociedade Brasileira da Ciência das Plantas Daninhas },  author={Carvalho, L.B and Alves, P.L.C.A and Bianco, S},  year={2013},  month={Jan},  pages={109–115} }