Rossato Junior, José Antonio de Souza, et al. “Popping Expansion and Yield Responses of Popcorn Cultivars under Different Row Spacings and Plant Populations”. Pesquisa Agropecuaria Brasileira, vol. 48, no. 12, Mar. 2014, pp. 1538-45, doi:10.1590/S1678-3921.pab2013.v48.11725.