Achmad, Simparmin Br. The Determination of The Best Sulphuric Acid Concentration at Pretreatment Stage on Lampung Natural Zeolit (Zal) as Thecatalyst for Glicerol and Acetic Acid Esterification Reaction to Form Triacetin. novan [Internet]. 2017Aug.1 [cited 2025Apr.24];5(02):112-20. Available from: https://jurnal.balitbangda.lampungprov.go.id/index.php/jip/article/view/39