1. The Bifurcated Root Canal in Lower Anterior Teeth;Rankine-Wilson;J. Am. Dent. Assoc,1965
2. Formation of Root-Canals in Human Teeth;Hess;J. Am. Dent. Assoc,1921
3. The Internal Anatomy of the Teeth With Special Reference to the Pulp With Its Branches;Barrett;Dent. Cosmos,1925
4. A Stereomicroscopic Study of the Root Apices of 400 Maxillary and Mandibular Anterior Teeth;Green;Oral Surg,1956
5. A Stereoscopic Investigation of the Anatomy of the Root Apices of 910 Maxillary and Mandibular Teeth;Ainamo;Odontol. Tidskr,1968