References
- Brenchley, M. L. (1965) Some spontaneous and advantageous tooth movements, Transactions of the British Society for the Study of Orthodontics, 129–133.
- Carlsen, D. B. and Meredith, H. V. (1960) Biological variation in selected relationships of opposing posterior teeth, Angle Orthodontist, 30, 162–173.
- Cookson, A. (1970) Space closure following loss of lower first premolars, Transactions of the British Society for the Study of Orthodontics, 27–32.
- Lloyd, T. G. and Stephens, C. D. (1979) Spontaneous changes in molar occlusion after extraction of all first pre-molars: A study of Class II Division 1 cases treated with removable appliances, British Journal of Orthodontics, 6, 91–94.