1. A Preliminary Report of an Investigation of Apical Root Resorption of Permanent Teeth;Ketcham;Int. J. Orthodontia,1927
2. A Progress Report of an Investigation of Apical Root Resorption of Permanent Teeth;Ketcham;Int. J. Orthodontia,1929
3. Root Resorption and Its Clinical Significance;Zemsky;J. Am. Dent. A.,1929
4. The Incidence of Root Resorption of Vital Permanent Teeth;Hemley;J. D. Res.,1941
5. Arrested Root Resorption During Orthodontic Treatment;Carman;Int. J. Orthodontia,1937