1. Treatment of non-vital pulps with formocresol;Wijk,1972
2. Inflammation and infection of pulp and periapical tissues;Naidorf;Oral Surg,1972
3. The relationship between infection and pathology in the pulp canal and periapical region;Smith;Oral Surg,1958
4. Infections of pulp and periapical tissues;Blechman,1968