1. Prevalence of malocclusion in relation to development of the dentition: An epidemiological study of Danish school children;Helm;Acta Odontol. Scand.,1970
2. Mandibular third molars and postretention crowding;Kaplan;Am. J. Orthod.,1974
3. Late lower arch crowding: Facial growth or forward drift?;Richardson;Eur. J. Orthod.,1979
4. Third molars and orthodontic diagnosis;Schulhof;J. Clin. Orthod.,1976
5. The normal movement of the mandibular teeth and the crowding of the incisors as a result of growth and function;Selmer-Olsen;Dent. Rec.,1937