A. Y. Bachtiar, A. C. Annas, A. N. A. Fajrin, M. H. Rizwan, and I. R. Kartikasari, “Techno-Economic and Feasibility Assessment of Cryogenic Distillation Membrane (CDM) for Purification Natural Gas from CO2”, IJE, vol. 4, no. 1, pp. 13-25, Feb. 2021.