1. Abbreviated periodontal examination;Stone;JADA,1976
2. Periodontal aspects of restorative dentistry;Ramfjord;J Oral Rehab,1974
3. Current procedural terminology for periodontists;Tobias,1972
4. Periodontal disease: prevalence and incidence;Marshall-Day;J Periodontol,1955
5. National Center for Health Statistics: Basic data on dental examination findings of persons, 1–74 years, US 1971–1974,1979