1. The principles of visual perception and their clinical application to denture aesthetics;Lombardi;J Prosthet Dent,1973
2. A new classification of human tooth forms with special reference to a new system of artificial teeth;Williams;Dent Cosmog,1914
3. Applying harmony in selecting and arranging teeth;Pound;Dent Clin North Am,1962
4. The geometric theory of selection of artificial teeth: is it valid?;Bell;JADA,1978
5. Introduction to dentogenic restorations;Frush;J Prosthet Dent,1955