1. Anatomy of the root canals of the teeth of the permanent dentition, part I;Hess,1925
2. The internal anatomy of the teeth with special reference to the pulp with its branches;Barrett;Dent Cosmos,1925
3. Anatomy of the root canals of the incisors, cuspids and bicuspids of the permanent teeth;Mueller;JADA,1933
4. Mesiodistal and buccalingual roentgenographic investigation of 7,275 root canals;Pineda;Oral Surg,1972
5. Double canals in single roots;Green;Oral Surg,1973