Pacheco, E. P., Mantovani, E. C., Martyn, P. J., & Oliveira, A. C. de. (1996). Evaluation of a precision seed planter. Pesquisa Agropecuaria Brasileira, 31(3), 209–214. https://doi.org/10.1590/S1678-3921.pab1996.v31.4473