“Modification of CaO Catalyst From Chicken Eggshell With Wet Impregnation Method for Two-Stage Process of Biodiesel from Tamanu Oil”. Jurnal Serambi Engineering 10, no. 3 (July 11, 2025). Accessed August 26, 2026. http://jse.serambimekkah.id/index.php/jse/article/view/1069.