1. Periodontal disease in adults, United States 1960–62;Kelly,1965
2. Periodontal treatment needs in Finnish adults;Markkanen,1982
3. Etiology of periodontal diseases;Caton;Curr Opin Dentistry,1991
4. Experimental gingivitis in man;Lo¨e;J Periodontol,1965
5. The status of epidemiological data on periodontal diseases;Burt,1988