Concentration Effect of MgO/K2O Catalyst on Transesterification of Castor Seed (Ricinus communis) Oil: Pengaruh Konsentrasi Katalis MgO/K2O pada Transesterifikasi Minyak Biji Jarak (Ricinus communis). Stannum [Internet]. 2024 Oct. 31 [cited 2026 Apr. 27];6(2):96-103. Available from: https://www.journal.ubb.ac.id/index.php/stannum/article/view/4692