1. Epidemiology of apical periodontitis;Eriksen,1998
2. The effects of surgical exposures of dental pulps in germ-free and conventional laboratory rats;Kakehashi;Oral Surg Oral Med Oral Pathol,1965
3. Bacteriological studies of necrotic dental pulps;Sundqvist,1976
4. Influence of periapical tissues of indigenous oral bacteria and necrotic pulp tissue in monkeys;Moller;Scand J Dent Res,1981
5. Defining the indigenous microbiota of the healthy oral cavity;Aas;J Dent Res,2003