Copaja, S. V., and D. Ferrer. “STUDY OF THE ADSORPTION-DESORPTION PROCESS OF THE METALS: Cu, Mn, Pb and Zn IN VOLCANIC SOILS.”. Journal of the Chilean Chemical Society, Vol. 69, no. 2, Jan. 2025, pp. 6140-8, https://jcchems.com/index.php/JCCHEMS/article/view/2691.