1. Begg orthodontic theory and technique;Begg,1977
2. Orthodontics: current principles and techniques,2000
3. Contemporary orthodontics;Proffit,1993
4. The nature of tooth movement;Storey;Am J Orthod,1973
5. Electric currents, bone remodeling, and orthodontic tooth movement;Davidovitch;Am J Orthod,1980