Suherman S, Muktar M, Kurniawan R, Abdullah I, Mawardi. Synthesis and Characterisation of Biolubricants Castor Oil (Ricinus communis L.) Using a Homogeneous Catalyst for Hydraulic Engine Applications. j.rekayasa.mesin. [Internet]. 2025 Aug. 31 [cited 2025 Oct. 10];20(2):217-28. Available from: https://jurnal.polines.ac.id/index.php/rekayasa/article/view/6669