Laksana BD, Akbar A. 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. PELS [Internet]. 2022 Jun. 30 [cited 2025 Jun. 25];2(2). Available from: https://pels.umsida.ac.id/index.php/PELS/article/view/1209