Thomazelli, Lúcio F., et al. “Seed Production of Selected Onion Cultivars in Santa Catarina State, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 25, no. 11, Apr. 2014, pp. 1607-12, doi:10.1590/S1678-3921.pab1990.v25.13701.