1. Beobachtungen über pyorrhea alveolaris;Karolyi;Osterreichisch-Ungarische Viertel Jahresschr Für Zahnheilkd,1901
2. The management of pyorrhea;Stillman;Dent Cosm,1917
3. What is traumatic occlusion and how can it be diagnosed and corrected;Stillman;J Am Dent Assoc,1925
4. American Academy of Periodontology Glossary of periodontal terms 2001 https://www.perio.org
5. Periodontal ligament stresses in the initiation of occlusal traumatism;Reinhardt;J Periodontal Res,1984