Salas-Tort, MSc. Dolores, Ing. Norma Marzal-Blanco, and Dra. Margarita Penedo-Medina. 2016. “Preliminary Study of the Adsorption of Nickel and Cobalt Using Charcoal From Foconut Shells”. Chemical Technology 32 (2), 166-76. https://doi.org/10.1590/2224-6185.2012.2.%x.