Gera, István. “A New Classification Scheme for Periodontal and Peri-Implant Diseases and Conditions – First Part: Gingival Health and Gingival Diseases: Based on the American Academy of Periodontology (AAP) and the European Federation of Periodontology (EFP) World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions (2017) Consensus Reports”. Hungarian Journal of Dentistry 111, no. 3. (September 16, 2018): 91-102. Accessed April 20, 2025. https://ojs.mtak.hu/index.php/fogorv-szemle/article/view/4887.