1. Orthodontics: principles and practice;Graber,1972
2. Interrelationships between orthodontics and periodontics;Kessler;Am J Orthod,1976
3. A clinical study on closing edentulous spaces in the mandible;Stepovich;Angle Orthod,1979
4. New system of regulation and retention;Angle;Dent Register,1887
5. Molar uprighting;Vanarsdall,1980