1. Oligodontia: a study of its prevalence and variation in 4032 children;Silverman;ASDC J Dent Child,1979
2. Hypodontia of permanent teeth in Danish schoolchildren;Rolling;Scand J Dent Res,1980
3. Congenitally missing second premolars in cleft lip and cleft palate children;Shapira;Am J Orthod Dentofacial Orthop,1999
4. Retrospective review of 1170 endosseous implants placed in partially edentulous jaws;Eckert;J Prosthet Dent,1998
5. The congenitally absent premolar problem;Valinoti;Angle Orthod,1958