AR, Naniek Ratni Juliardi, and Dimas Hafiizh Wicaksono. “Use of Copper As A Converter Catalyst on Motorcycle Exhaust to Reduce Hydrocarbon (Hc) Emissions”. Nusantara Science and Technology Proceedings, vol. 2023, no. 36, Dec. 2023, pp. 83-89, https://doi.org/10.11594/nstp.2023.3614.