1. Incidence of congenital anomalies in permanent teeth of a group of Canadian children aged 6-9;Castaldi;J Can Dent Assoc,1966
2. Malocclusion in Danish children with adolescent dentition;Helm;Am J Orthod,1968
3. Radiographic determination of the prevalence of selected dental anomalies in children;Mckibben;J Dent Child,1971
4. Frequency of malocclusion and need of orthodontic treatment in 10-year old children in Gothenburg;Ingervall;Swed Dent J,1972
5. The prevalence of malocclusion in Swedish schoolchildren;Thilander;Scand J Dent Res,1973