Tan, M., I. Yakub, and T.-Y. Yun Hin. “Passive Nitrogen Oxides Removal from a Diesel-Engine Exhaust Gas Using a Biomass-Carbon Catalyst”. Journal of Applied Science & Process Engineering, Vol. 7, no. 1, Apr. 2020, pp. 479-88, doi:10.33736/jaspe.2213.2020.