Nirmala Putri Soranta, Ina Hendiani, Nunung Rusminah, Ganesha Wandawa, and Suhadi. “Effects of Hyperbaric Oxygen Therapy on MMP-8 Saliva Levels in Chronic Periodontis: A Preliminary Research”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 60, no. 4, Oct. 2021, pp. 45-55, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/13346.