1. The gingival smile line;Peck;Angle Orthod,1992
2. A morphometric analysis of the posed smile;Ackerman;Clin Orthod Res,1998
3. An evaluation of smiles before and after orthodontic treatment;Mackley;Angle Orthod,1993
4. Dynamic smile visualization and quantification: part 2. Smile analysis and treatment strategies;Sarver;Am J Orthod Dentofacial Orthop,2003
5. Esthetic factors involved in anterior tooth display and the smile;Zachrisson;J Clin Orthod,1998