Valencia, R., 		Trinovita, E., 		Shinta, H., 		Toemon, A., & 		Ysrafil, Y.
2025 Apr 30.  Evaluation of the combination patch of betel leaf extract (Piper sp.) - ultrasonic assisted extraction as a transdermal delivery system on fibroblast cell formation and collagen density. JURNAL ILMU KEFARMASIAN INDONESIA. [Online] 23:1