1. On an equilibrium theory of tooth position;Weinstein;Angle Orthod,1963
2. Equilibrium theory revisited: Factors influencing position of the teeth;Proffit;Angle Orthod,1978
3. The influence of maximum perioral and tongue force on the incisor teeth;Posen;Angle Orthod,1972
4. The application of quantitative perioral assessment to orthodontic case analysis and treatment planning;Posen;Angle Orthod,1976
5. The value of clinical lip strength measurements;Ingervall;Am J Orthod,1981