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Chan, A.; Leny, L.; Marlina, T.; Diana, V. Hand Sanitizer Gel Formulation of Betel (Piper Betle L.) Leaf Ethanol Extract and Utilization of Pineapple Skin Ethanol Extract (Ananas Comosus L.) Againts the Bacteria Staphylococcus Aureus. journal-jps.com 2022, 5, 451-463.