Putri, A. N., Laila, N. and Forestryana, D. (2019) “Formula Optimization of Annona muricata Folium Ethanolic Extract of Anti Acne Gel Formulation using Factorial Design Method”, Borneo Journal of Pharmacy. Palangka Raya, Indonesia, 2(2), pp. 63–70. doi: 10.33084/bjop.v2i2.981.