1. Measurement of color of human teeth;Clark,1983
2. Double layer effects in porcelain systems;O'Brien;J Dent Res,1985
3. The use of porcelain-fused-to-metal restorations in current dental practice;Christensen;J Prosthet Dent,1986
4. Clinical performance of metal-ceramic restorations: a fiveyear progress report;Morris,1989
5. Causes of failure following oral rehabilitation: biological versus technical factors;Strub;Quintessence Int,1988