1. Clinical and histologic observations on tooth movement during and after orthodontic treatment;Reitan;Am J Orthod,1967
2. Threshold and optimum force values for maxillary anterior tooth movement;Burstone;J Dent Res,1961
3. Force in orthodontics and its relation to tooth movement;Storey;Aust Dent J,1952
4. The importance of force in Orthodontics;Smith;Aust Dent J,1952
5. Optimal force, differential force and anchorage;Hixon;Am J Orthod,1969