1. A study of periodontal hazards of third molars;Ash;J. Periodontal.,1962
2. Photogrammetric principles applied to intraoral radiodontia. I;Berghagen,1951
3. Removal of third molars as a phase of preventive dentistry;Costich;Dent. Abstr.,1968
4. Extraction of teeth as a prophylactic measure;Gilmour;Br. Dent. J.,1925
5. Indications for the removal of impacted third molars at an early age;Hillin;Am. J. Orthod. & Oral Surg.,1947