Fleck, Nilson Gilberto, and Paulo Regis Ferreira da Silva. “Kinds of Weed Control in Sunflower Culture through Different Hoeings”. Pesquisa Agropecuaria Brasileira 26, no. 9 (September 1, 1991): 1523–1529. Accessed November 14, 2025. https://apct.sede.embrapa.br/pab/article/view/3494.