1. A method for classification of errors in dental esthetics;Lombardi;J Prosthet Dent,1974
2. Dental esthetics and golden proportion;Levin;J Prosthet Dent,1978
3. Artistic anatomy;Richer,1971
4. The science and art of porcelain laminate veneers;Gurel,2003
5. An analysis of selective tooth proportions;Gillen;Int J Prosthodont,1994