M. Hernández-Rodríguez, A. Otero-Calvis, J. Falcón-Hernández, and Y. Yperman, “Adsorption of NI (II) on activated Carbon of Coconut shell Chemicaly Modifieded with Acid Nitric Solutions”, TQ, vol. 37, no. 1, pp. 16-30, Jan. 2017.