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2. A progress report of an investigation of apical root resorption of permanent teeth;Ketcham;Int J Orthodontia, Oral Surg, Radiogr,1929
3. A comparative study in root resorption in permanent teeth;Rudolph;J Am Dent Assoc,1936
4. An evaluation of root resorption occurring during orthodontic treatment;Rudolph;J Dent Res,1940
5. Orthodontic prognosis;Becks;Am J Orthod,1939