1. The anatomy of the root canals of the teeth of the permanent dentition;Hess,1925
2. Anatomy of the root canals;Okumura;J Am Dent Assoc,1927
3. Comparación de hallazgos radiológicos y de transparentación en la anatomía de conductos radiculares;Diaz,1977
4. Root canal morphology of the human mandibular first molar;Skidmore;Oral Surg,1971
5. Mesiodistal and buccolingual roentgenographic investigation of 7275 root canals;Pineda;Oral Surg,1972