@article{grotta_furlani_silva_lopes_reis_2009,  title={Seeder-fertilizer machine: energetic demand as a function of vegetal covering handling and manure deposition shank depth in no-tillage system},  volume={29},  ISSN={0100-6916},  url={https://doi.org/10.1590/S0100-69162009000200007},  DOI={10.1590/S0100-69162009000200007},  number={2},  journal={Engenharia Agrícola},  publisher={Associação Brasileira de Engenharia Agrícola},  author={Grotta, Danilo C. C. and Furlani, Carlos E. A. and Silva, Rouverson P. da and Lopes, Afonso and Reis, Gustavo N. dos},  year={2009},  month={Apr},  pages={241–248} }