1. Hypodontia in the permanent dentition;Grahnén;Odontol Revy,1956
2. Hypodontia of permanent teeth: an orthopantomographic study;Haavikko;Suom Hammaslääk Toim,1971
3. Third molar polymorphism and its significance to dental genetics;Garn;J Dent Res,1963
4. Genetics of dental development;Garn,1977
5. Treatment of impacted teeth by surgical exposure: a survey study;Thilander;Swed Dent J,1973