Pramesti, I. N., Iqbal, M. A., Retnosari, R., & Octaviana, L. (2026). Ultrasonic-Assisted Synthesis of Methyl Ester Sulfonate (MES) from Coconut Oil via Transesterification and Sulfonation Using Eggshell-Derived CaO Catalyst . Al-Kimia, 14(1). https://doi.org/10.24252/al-kimia.v14i1.62602