Kurniati, Ika D., et al. “Muntingia Calabura Modulates Alveolar Matrix Metalloproteinase-9 (MMP-9) and Decreases The Alveolar Diameter in Sprague-Dawley Rats Exposed to Cigarette Smoke”. Tropical Journal of Natural Product Research (TJNPR), vol. 9, no. 4, Apr. 2025, pp. 1853 – 1859, https://doi.org/10.26538/tjnpr/v9i4.60.