1. Root canal morphology and its relationship to endodontic procedures;Vertucci;Endod Topics,2005
2. Systematisches Handbuch der Zahnheikunde;Carabelli,1844
3. Bemerkungen u ber Wurzelvariationen am menschlichen unteren Molaren;Bolk;Zeiting fur Morphologie Anthropologie,1915
4. Tooth morphology and access cavity preparation;Vertucci,2006
5. Pathology of the dental hard tissues;Pindborg,1970