Farahdila, K., P. S. Goh, A. F. Ismail, N. F. W. M. Wan, H. M. H. Mohd, W. K. Soh, and S. Y. Yeo. “Challenges in Membrane Process for Gas Separation from Natural Gas”. Journal of Applied Membrane Science & Technology 25, no. 2 (July 7, 2021): 89–105. Accessed September 24, 2021. https://amst.utm.my/index.php/amst/article/view/222.