de Souza, Francisco Ronaldo Sarmanho, et al. “Yielding and Phenotypic Stability of Corn Cultivars in Three Municipal Districts of Pará State, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 37, no. 9, Sept. 2002, pp. 1269-74, doi:10.1590/S1678-3921.pab2002.v37.6466.