1. Some esthetic factors in a smile;Tjan;J Prosthet Dent,1984
2. The gingival smile line;Peck;Angle Orthod,1992
3. Some esthetic factors involved in anterior tooth display and the smile: vertical dimension;Zachrisson;J Clin Orthod,1998
4. Comparing the perception of dentists and lay people to altered dental esthetics;Kokich;J Esthet Dent,1999
5. Dynamic smile visualization and quantification: part 1. Evolution of the concept and dynamic records for smile capture;Sarver;Am J Orthod Dentofacial Orthop,2003