1. Esthetic principles for ceramometal restorations;Goldstein;Dent. Clin. North Am.,1977
2. Light and color in dentistry;McPhee;J. Mich. Dent. Assoc.,1978
3. Four Color Tooth Dimensional System;Muia,1982
4. Properties of a new high expansion core material for porcelain crowns;O’Brien;J. Dent. Res.,1984