1. Precision dies from elastic impressions;Benfield;J. Prosthet. Dent.,1962
2. The use of the semiprecision rest in removable partial dentures;Blatterfein;J. Prosthet. Dent.,1969
3. McCracken’s Removable Partial Prosthodontics;Henderson,1973
4. The Pindex System Operating Instruction Manual, Whaledent International, 1976.
5. Semiprecision rest system for distal-extension removable partial dentures;Zinner;J. Prosthet. Dent.,1979