1. The dependence of the results of pulp therapy on certain factors: an analytical study based on radiographic and clinical follow-up examinations;Strindberg;Acta Odontol Scand,1956
2. Consideration and concepts of case selection in the management of post-treatment endodontic disease (treatment failure);Friedman;Endod Topics,2002
3. Aetiology of root canal failure: why well-treated can fail;Siqueira;Int Endod J,2001