1.
Sitompul SOC, Mohadi R. Preparation of calcium oxide from cattle bones as catalyst for conversion of waste cooking oil to biodiesel. sci. technol. indones. [Internet]. 2017 Jul. 8 [cited 2026 Sep. 14];2(3):76-9. Available from: https://www.sciencetechindonesia.com/index.php/jsti/article/view/29