1. The incidence of impacted teeth: a survey at Harlem Hospital;Kramer;Oral Surg Oral Med Oral Pathol,1970
2. The incidence of unerupted permanent teeth and related clinical cases;Grover;Oral Surg Oral Med Oral Pathol,1985
3. A survey of 3874 routine full-mouth radiographs, II: a study of impacted teeth;Dachi;Oral Surg Oral Med Oral Pathol,1961
4. The prevalence of malocclusion in Swedish school children;Tilander;Scand J Dent Res,1973
5. Studies of permanent tooth anomalies in 7,886 Canadian individuals, I: impacted teeth;Shah;J Can Dent Assoc,1978