Istiqomah, Widayat W, Philia J, Sriyono, Mangunkusumo KGH, Alam AS, et al. Castor-Based Ester Oil Production Using SnCl₂/HZSM-5 Catalyst for Sustainable Transformer. Emerg Sci J [Internet]. 2026 Apr. 1 [cited 2026 May 28];10(2):714-28. Available from: https://ijournalse.org/index.php/ESJ/article/view/3314