Siregar, Jovany Joshua, Mirza Faris Rahman, and Rafief Baharrudin. “Pertamax Quality Improvement With Ethanol on Octane Number, Density and Water Content”. Proceeding International Conference on Religion, Science and Education 3 (March 20, 2024): 691–697. Accessed July 8, 2026. https://sunankalijaga.org/prosiding/index.php/icrse/article/view/1054.