Mulyatun Mulyatun, Jedy Prameswari, Istadi Istadi, Widayat Widayat, (2022). “Production of Non-Food Feedstock Based Biodiesel using Acid-Base Bifunctional Heterogeneous Catalysts: A Review”, Fuel, Vol. 314, Paper no. 122749, 15 April 2022, DOI: https://doi.org/10.1016/j.fuel.2021.122749, (Q1)