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Mardhiyah; Resty Pevita; Linda Advinda; Mades Fifendy. Antimicrobial Test of Betel Leaf Extract Formulation (Piper Betle L.) With Yam Bean (Pachyrhizus Erosus L.) to Staphylococcus Aureus Bacteria of Acne Caused. prosemnasbio 2022, 1, 1420-1426.