1. Occlusal Considerations in Preventive Care;Rieder;J. Prosthet. Dent.,1972
2. Bell, W. E.: Personal communication, Dallas, Texas, Oct., 1973.
3. Blackwood, H. J. J.: Personal communication, University of London, England, Oct., 1973.
4. Bock, O.: Personal communication, University of Erlangen-Nurnberg, Germany, Oct., 1973.
5. Boucher, C. O.: Personal communication, Ohio State University, Columbus, Ohio, Oct., 1973.