1. McCracken's Removable Partial Prosthodontics;Henderson,1973
2. McCracken's Removable Partial Prosthodontics;Henderson,1973
3. Essentials for Removable Partial Denture Prosthesis;Applegate,1959
4. Restorative Dental Materials;Craig,1980
5. A comparison of the flexibility of wrought wire and cast circumferential clasps;Frank;J Prosthet Dent,1983