T. R. Silva Ribeiro, D. C. de Melo Silva, T. Pereira Martins da Costa, and A. O. Sousa da Silva, “INCORPORATION OF ALKALINE-EARTH METALS Ca, Mg, Ba and Sr IN MCM-41 FOR APPLICATION AS CO2 ADSORVENTS IN THE PRE-SALES NATURAL GAS CURRENTS”, J. Eng. Exact Sci., vol. 5, no. 2, pp. 0148–0152, Apr. 2019.