1. The six keys to normal occlusion;Andrews;Am J Orthod,1972
2. Moments with the edgewise appliance: Incisor torque control;Isaacson;Am J Orthod Dentofac Orthop,1993
3. Initial tissue behavior during apical root resorption;Reitan;Angle Orthod,1974
4. Differential force in orthodontic treatment;Begg;Am J Orthod,1956