Research on the Effect of the Addition of Trembesi Leaf Extract on Motorcycle Exhaust Emissions: Penelitian Tentang Pengaruh Penambahan Ekstrak Daun Trembesi Terhadap Emisi Gas Buang Sepeda Motor. (2022). Procedia of Engineering and Life Science, 2(2). https://doi.org/10.21070/pels.v2i2.1209