1. Microbial aetiology of endodontic treatment failure and pathogenic properties of selected species;Figdor,2002
2. Epidemiology of apical periodontitis;Eriksen,1998
3. Endodontology—epidemiologic considerations;Eriksen;Endod Dent Traumatol,1991
4. 1990 Survey of Dental Services Rendered;American Dental Association,1994
5. A historic review of endodontics, 1689-1963, part 1;Cruse;J Endod,1980