AR, Naniek Ratni Juliardi, and Dimas Hafiizh Wicaksono. 2023. “Use of Copper As A Converter Catalyst on Motorcycle Exhaust to Reduce Hydrocarbon (Hc) Emissions”. Nusantara Science and Technology Proceedings 2023 (36): 83-89. https://doi.org/10.11594/nstp.2023.3614.