Sfredo, Gedi Jorge, and José Renato Sarruge. “Micronutrient Contents in Different Parts of Sunflower Plants”. Pesquisa Agropecuaria Brasileira 25, no. 12 (April 17, 2014): 1727–1732. Accessed October 15, 2026. https://apct.sede.embrapa.br/pab/article/view/13722.