Synthesis and performance assessment of coconut fiber solid adsorbent for waste cooking oil purification as biodiesel feedstock. Mal. J. Fund. Appl. Sci. [Internet]. 2020 Jun. 15 [cited 2026 Sep. 7];16(3):374-7. Available from: https://mjfas.utm.my/index.php/mjfas/article/view/1522