Mohd Supian, Muhammad Shaukie. “Catalytic Pyrolysis of High-Density Polyethylene (HDPE) by Using Multiple Stage Reactor ”. Progress in Engineering Application and Technology, vol. 3, no. 2, Dec. 2022, pp. 708–721, https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/6417.