@article{silva_duarte_oliveira_silva_2007,  title={Effect of planting density on green ear yield of maize cultivars bred in different periods},  volume={25},  ISSN={0102-0536},  url={https://doi.org/10.1590/S0102-05362007000200005},  DOI={10.1590/S0102-05362007000200005},  number={2},  journal={Horticultura Brasileira},  publisher={Associação Brasileira de Horticultura},  author={Silva, Paulo Sérgio L e and Duarte, Severino R and Oliveira, Fábio Henrique T de and Silva, Júlio César do V},  year={2007},  month={Apr},  pages={154–158} }