References
- Begg, P. R. and Kessling, P. C. (1971) Begg orthodontic theory and technique, Philadelphia: W. B. Saunders Company. Pp. 613–628.
- Guyton, A. C. (1971) Textbook of medical physiology, p. 223, Philadelphia: W. B. Saunders Company.
- Landau, L. D. and Lifshitz, E. M. (1970) Theory of elasticity, Oxford: Pergamon Press.
- Steyn, C. L. (1976) Measurement of edgewise torque force in vitro, American Journal of Orthodontics, in press.
- Wheeler, R. C. (1965) A textbook of dental anatomy and physiology, Philadelphia: W. B. Saunders Company.