1. Anatomy of the root canals of the teeth of the permanent dentition: Part II;Hess,1925
2. Further evidence that root canal can be filled to the dentinocemental junction;Grove;J Am Dent Assoc,1930
3. Microscopic investigation of root apexes;Kuttler;J Am Dent Assoc,1955
4. A new method of tooth length determination for endodontic practice;Best;Dent Digest,1960
5. Estimating endodontic “working length” with paralleling radiographs;Van de Voorde;Oral Surg Oral Med Oral Pathol,1969