Effectiveness of sulfuric acid and hydrochloric acid catalysts in the esterification of frankincense cinnamic acid with ethanol and methanol. J.Pendidik.Kim [Internet]. 2024 Apr. 30 [cited 2026 Apr. 22];16(1):50-6. Available from: https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/53231