González-Rivero, Rosa Amalia, et al. “Quantification of Nickel and Cobalt in Wastewater from a Gold Mineral Processing Plant”. Revista Cubana De Química, vol. 33, no. 3, Oct. 2021, pp. 345-66, https://cubanaquimica.uo.edu.cu/index.php/cq/article/view/5190.