Piacentini, Luiz Carlos, et al. “The Agronomic Performance and Physicochemical Characteristics of Onion Genotypes under Different Spacing in the Humid Amazonian Tropics”. International Journal for Innovation Education and Research, vol. 9, no. 4, Apr. 2021, pp. 331-49, https://doi.org/10.31686/ijier.vol9.iss4.3061.