Laksana, Bayu Dwi, and Ali Akbar. “Research on the Effect of the Addition of Trembesi Leaf Extract on Motorcycle Exhaust Emissions”. Procedia of Engineering and Life Science 2, no. 2 (June 30, 2022). Accessed May 2, 2024. https://pels.umsida.ac.id/index.php/PELS/article/view/1209.