Coelho, Eugênio Ferreira, et al. “Onion Yields under Three Water Regimes and Five Spacings”. Pesquisa Agropecuaria Brasileira, vol. 31, no. 8, Aug. 1996, pp. 585-91, https://doi.org/10.1590/S1678-3921.pab1996.v31.4525.