Nedel, Jorge Luiz. “Genetic Improvement on Grain Yield of Wheat Cultivars Released Between 1940 and 1992”. Pesquisa Agropecuaria Brasileira, vol. 29, no. 10, Oct. 1994, pp. 1565-70, doi:10.1590/S1678-3921.pab1994.v29.4209.