L. Kalsum, Rusdianasari, and Abu Hasan, “Analysis of Flow Rate and Concentration of Mono Ethanol Amine (MEA) in the Biogas Purification Using Absorption Column with Pall Ring Packing”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 15, no. 3, pp. 991–996, Jun. 2025.