1. Begg orthodontic theory and technique;Begg,1977
2. The Alexander discipline;Alexander,1986
3. Occlusal stability in Class II, Division 1, deep bite cases followed up for many years after orthodontic treatment;Kondo;Am J Orthod Dentofacial Orthop,1998
4. Biomechanical aspects of stability of occlusion: retention and stability in orthodontics;Kubein-Meesenburg,1993
5. Orthodontics principles and practice;Graber,1966