1. Esthetics, environment, and the law of lip relation;Ricketts;Am J Orthod,1968
2. Professional assessments of varied silhoutte facial profiles;Czarnecki,1984
3. The integumental profile;Burstone;Am J Orthod,1958
4. Planning treatment on the basis of facial pattern and an estimate of its growth;Ricketts;Angle Orthod,1957
5. A metric analysis of the facial profile;Bowker;Angle Orthod,1959