de Almeida, Milton Luiz, and Paulo Regis Ferreira da Silva. “Effect of Plant Density, Sowing Date and Fertilization on the Sunflower Agronomic Characteristics. I. Grain Yield and Oil and Yield Components”. Pesquisa Agropecuaria Brasileira 28, no. 7 (July 1, 1993): 833–841. Accessed January 3, 2026. https://apct.sede.embrapa.br/pab/article/view/3944.