1. Emergence profiles in natural tooth contour. Part I. Photographic observations;Croll;J Prosthet Dent,1989
2. Current controversies in axial contour design;Tjan;J Prosthet Dent,1980
3. Dental anatomy and physiology;Wheeler,1963
4. Complete crown form and the periodontium;Wheeler;J Prosthet Dent,1961
5. Provisional splinting—principles and technics;Amsterdam;Dent Clin North Am,1959