“THE EFFECT OF VARIATIONS IN CONCENTRATION OF BETEL LEAF ETHANOL EXTRACT IN HAND SANITIZER PREPARATIONS ON THE ANTIBACTERIAL ACTIVITY OF ESCHERICHIA COLI AND STAPHYLOCOCCUS AUREUS”. Proceedings OPTIMAL 4, no. 1 (October 30, 2026). Accessed November 5, 2026. https://proceedings.nuansafajarcemerlang.com/index.php/ico/article/view/235.