1. Hypodontia in the permanent dentition;Grahenen;Odontol Revy,1956
2. Agenesis of teeth of the permanent dentition. A frequency study of Sydney schoolchildren;Davies;Aust Dent J,1968
3. The great eights debate: do the mandibular third molars affect incisor crowding? A review of the literature;Robinson;Dent Update,1993
4. Our third molar teeth: Their eruption, presence and absence;Hellman;Dent Cosmos,1936
5. Mandibular growth and third molar impaction;Björk;Acta Odontol Scand,1956