Neupane, M., Sharma, S., Dahal, P., Devkota, L. K., & Dhakal, R. P. (2026). Engine Performance and Emission Analysis of TiO2 Nanoparticle-Enhanced Waste Cooking Oil Biodiesel. Himalayan Journal of Applied Science and Engineering, 6(2), 59–73. https://doi.org/10.3126/hijase.v6i2.90242