1. Minimum forces in tooth movement;Weinstein;Am. J. Orthod.,1967
2. Tissue changes incidental to orthodontic tooth movement;Schwartz;Int. J. Orthod.,1932
3. Force in orthodontics and its relation to tooth movement;Storey;Aust. J. Dent.,1952
4. The importance of force in orthodontics: The design of cuspid retraction springs;Smith;Aust. J. Dent.,1952
5. Differential force in orthodontic treatment;Begg;Am. J. Orthod.,1956