1. Determination of the normal arch, and its application to orthodontia;Hawley;Dent Cosmos,1905
2. Treatment of malocclusion of the teeth and fractures of the maxillae;Angle,1907
3. Diagnostic and treatment planning in orthodontics;Sarver,1994
4. Principles of retention in orthodontia;Case;Int J Orthod Oral Surg,1920
5. A review of the retention problem;Riedel;Angle Orthod,1960