1. Esthetics: A comparison of dentists’ and patients’ concepts;Brisman;J Am Dent Assoc,1980
2. An analysis of selected normative tooth proportions;Gillen;Int J Prosthod,1994
3. House MM, Loop JL: Form and Color Harmony in the Dental Art. Monograph, Whittier, CA, 1937, pp 3-33
4. The Divine Proportion;Huntley,1970
5. Dental esthetics and the golden proportion;Levin;J Prosthet Dent,1978