Sfredo, G.J. and Sarruge, J.R. 2014. Micronutrient contents in different parts of sunflower plants. Pesquisa Agropecuaria Brasileira. 25, 12 (Apr. 2014), 1727–1732. DOI:https://doi.org/10.1590/S1678-3921.pab1990.v25.13722.