2023. Nanocrystalline Toothpaste Formulation of Usnic Acid and Antibacterial Activity Test Against Streptococcus Mutans. JPK : Jurnal Proteksi Kesehatan. 12, 1 (Jul. 2023), 70–76. DOI:https://doi.org/10.36929/jpk.v12i1.677.