Vaz, D. de O., Fernandes, A. N., & Szpoganicz, B. (2018). Complexations of Divalent Metallic Ions with Fulvic Acids. Eclética Química, 43(1), 54–58. https://doi.org/10.26850/1678-4618eqj.v43.1.2018.p54-58