1. Development and verification of the proximal/marginal plaque index;Benson;Journal of Clinical Dentistry,1993
2. The interdental bleeding index: a simplified procedure for monitoring gingival health;Caton;Compendium of Continuing Education,1985
3. A modified gingival index for use in clinical trials;Lobene;Clinical Preventive Dentistry,1986
4. Periodontal disease in pregnancy (I). Prevalence and severity;Loe;Acta Odontologica Scandinavica,1963