1. The indication, for extraction of teeth in orthodontic procedure;Tweed;Am J Orthod,1944
2. A review of the retention problem;Riedel;Angle Orthod,1960
3. The irregularity index: a quantitative score of mandibular anterior alignment;Little;Am J Orthod,1975
4. The limitation of orthodontic treatment;Nance;Am J Orthod,1947
5. The dentition of the growing child;Moorrees,1959