1. Pathways of the pulp;Cohen,1976
2. Conductos radiculares, Pt. I;Pucci,1944
3. Root canal morphology of the human mandibular first molar;Skidmore;Oral Surg,1971
4. Anatomia odontológica;Aprile,1975
5. A clearing technique for the study of root canal systems;Robertson;J Endodon,1980