1. The Failure of Retainers in Bridge Prostheses;Roberts;Br. Dent. J.,1970
2. Retention of Post Crowns;Colley;Br. Dent. J.,1968
3. Retention Relative to the Crowning of Root Filled Anterior Teeth and the Problems of Root Fracture;Charlton;Q. Dent. Rev.,1972
4. Combe, E. C.: Unpublished results, 1972–1974.