Muhamad, Z., S. Sulistyo, N. Sri, and B. Adry Sefar. “Comparison of Three Way Catalytic Converter Exhaust Gas With Pertalite, Pertamax, and Pertamax Turbo Fuel in Gasoline Motor”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 57, no. 1, July 2019, pp. 97-108, https://www.asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/4945.