Penedo-Medina, D. M., Manals-Cutiño, M. E. M., Vendrell-Calzadilla, M. F., & Salas-Tort, M. D. (2015). Nickel and Cobalt Adsorption on Activated Coal of Coconut Shell. Chemical Technology, 35(1), 73-91. https://doi.org/10.1590/2224-6185.2015.1.%x