Al Kindi, H. ., A. K. . Fadillah, I. . Yuliana, E. . Hartulistiyoso, S. Salundik, and A. H. . Tambunan. “EXPERIMENTAL STUDY ON PRESSURIZED ADSORPTION OF CARBON DIOXIDE AND METHANE FROM COMPLEX GAS MIXTURE OF BIOGAS IN ZEOLITE 13X”. ASEAN Engineering Journal, vol. 13, no. 1, Feb. 2023, pp. 119-23, doi:10.11113/aej.v13.18443.