1. Cleaning and shaping the root canal;Schilder;Dent Clin North Am,1974
2. Root canal wall thickness of mandibular molars after biomechanical preparation;Montgomery;J Endodontics,1985
3. Endodontic failures;Grossman;Dent Clin North Am,1972
4. Common failures in endodontics and their correction;Cattoni;Dent Clin North Am,1963
5. Endodontic mishaps: perforations;Bakland;California Dental Association Journal,1991