References
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- McCallin, S. G. (1953) Retraction of maxillary teeth with removable appliances using intermaxillary traction or extra-oral traction, Transactions of the British Society for the Study of Orthodontics, 104–111.
- McCallin, S. G. (1961) Extra-oral traction in orthodontics, Transactiom of the British Society for the Study of Orthodontics, 1–14.
- Nicholson, P. T. (1979) Extra-oral anchorage to upper removable appliances, British Dental Journal, 147, 45–46.
- Plint, D. A. (1961) A method of treating Class II, Div. 1 cases without using the lower arch for anchorage or traction, Transactions of the British Society for the Study of Orthodontics, 49–55.
- Secl, D. (1967) A rationalization of some orthodontic clasping problems, Dental Practitioner, 17, 188–195.
- Usiskin, L. A. and Webb, W. G. (1972) Extra-oral anchorage for upper removable orthodontic appliances, British Dental Journal, 133, 140–145.