HoustonW. J. B. and WatersN. W. (1976) The design of buccal canine retraction springs for removable orthodontic appliancesBritish Journal of Orthodontics, 4, 191–195.
2.
WatersN. W. (1982) The mechanics of buccal canine retraction springs for removable orthodontic appliances, British Journal of Orthodontics, 9, 164–172.