1. Current orthodontic concepts and techniques;Graber,1969
2. Orthodontics, a historical review of its origin and evolution;Weinberger,1926
3. Bone changes during tooth movement;Oppenheim;Int. J. Orthod.,1930
4. Treatment of malocclusion of teeth;Angle,1907
5. A new x-ray technique and its application to orthodontics;Broadbent;Angle Orthod.,1931