1. Retention;Riedel,1975
2. Morphologic factors involved in the biology of relapse;Enlow;J CH Tweed Found,1980
3. The irregularity index: a quantitative score of mandibular anterior alignment;Little;Am J Orthod,1975
4. Posttreatment stability in adult and adolescent orthodontic patients: a cast analysis;Harris;Int J Adult Orthod Orthog Surg,1994
5. The dentition of the growing child: a longitudinal study of dental development between 3 and 18 years of age;Moorrees,1959