da Silva, Paulo Regis Ferreira, and Mauro Antônio Rizzardi. “Response of Sunflower Cultivars to Plant Density in Two Planting Dates. II. Characteristics Associated With Harvesting”. Pesquisa Agropecuaria Brasileira 28, no. 6 (June 1, 1993): 689–700. Accessed November 16, 2025. https://apct.sede.embrapa.br/pab/article/view/3927.