1. Classification of malocclusion;Angle;Dental Cosmos,1899
2. The frequency of orthodontic anomalies at various ages;Korkhaus;Int J Orthod,1928
3. Malocclusion in school children of the west Midlands;Goose;Br Dent J,1957
4. Prevalence of malocclusion in children aged 14-18 years;Massler;Am J Orthod,1951
5. Various types of occlusion and amounts of overbite in normal and abnormal occlusion between 2 and 12 years;Goldstein;Int J Orthod,1936