Syam, S. R. M., Budiyono, B., & Hadiyanto, H. (2026). Global research trends in biodiesel production from palm fatty acid distillate (PFAD) using CaO, MgO, and TiO2 heterogeneous catalysts: a bibliometric analysis (2015-2025). Communications in Science and Technology, 11(1), 82–99. https://doi.org/10.21924/cst.11.1.2026.1878