1. An investigation into the initial discomfort caused by placement of an arch wire;Jones;Eur J Orthod,1984
2. Selecting forces in orthodontics;Reitan;Eur Orthod Soc Trans,1956
3. Force in orthodontics and the relation to tooth movement;Storey;Aust Dent J,1952
4. Optimal force, differential force and anchorage;Hixon;Am J Orthod,1969
5. Pain, its nature, analysis, and treatment;Bond,1979