Nepomuceno, Alexandre Lima, and Paulo Regis ferreira da Silva. “Effect of Plant Arrangement and Weed Competition on Plant Traits Related to Sunflower Harvesting”. Pesquisa Agropecuaria Brasileira 27, no. 7 (July 1, 1992): 1057–1063. Accessed July 5, 2026. https://apct.sede.embrapa.br/pab/article/view/3742.