1. Incidence of impacted teeth;Mead;Int J Orthod,1930
2. Our third molar teeth: their eruption, presence and absence;Hellman;Dental Cosmos,1936
3. A survey of 3,874 routine full-mouth radiographs: II. a study of impacted teeth;Dachi;J Oral Maxillofac Surg,1961
4. The incidence of impacted teeth;Kramer;Oral Surg Oral Med Oral Pathol,1970
5. Mandibular growth and third molar impaction;Bjork;Acta Odontol Scand,1956