Valois, Afonso Celso Candeira, and Roland Vencovsky. “Effects of Stratified Mass Selection on Two Corn Populations and on Heterosis of Their Crosses”. Pesquisa Agropecuaria Brasileira, vol. 18, no. 10, Apr. 2014, pp. 1099-07, doi:10.1590/S1678-3921.pab1983.v18.15432.