1. Vertucci FG, Haddix JE, Britto LR (2006) Tooth morphology and access cavity preparation. In: Cohen S, Hargreaves KM, editors. Pathways of the Pulp. (9th edn), Mosby, St Louis, Missouri, USA. pp. 148-232.
2. Vertucci FJ, Williams RG (1974) Root canal anatomy of the mandibular first molar. J N J Dent Assoc 45(3): 27-28.
3. Barker BC, Parsons KC, Mills PR, Williams GL (1974) Anatomy of root canals. III. Permanent mandibular molars. Aust Dent J 19(6): 408-413.
4. Beatty RG, Krell K (1987) Mandibular molars with five canals: Report of two cases. J Am Dent Assoc 114(6): 802-804.
5. Mandibular first molars with multiple mesial canals;Jacobsen;J Endod 20(12),1994