1. Hypodontia of permanent teeth in Danish school children;Rolling;Scand J Dent Res,1980
2. An orthopantomographic study of hypodontia, supernumeraries and other anomalies in school children between the ages of 8-9 years. An epidemiological study;Bergstrom;Swed Dent J,1977
3. Genealogy and consequences of congenitally missing second premolars;Svedmyr;J Int Assoc Dent Child,1983
4. Extraction of deciduous second molar in hypodontia;Lindqvist;Eur J Orthod,1980
5. The long-term survival of lower second primary molars in subjects with agenesis of the premolars;Bjerklin;Eur J Orthod,2000