1. The irregularity index: a quantitative score of mandibular anterior alignment;Little;Am J Orthod,1975
2. Mandibular arch length increase in the mixed dentition: postretention evaluation of stability and relapse;Little;Am J Orthod Dentofacial Orthop,1990
3. Serial extraction of first premolars: postretention evaluation of stability and relapse;Little;Angle Orthod,1990
4. Mandibular second premolar extraction: postretention evaluation of stability and relapse;McReynolds;Angle Orthod,1991
5. Early versus late treatment of crowded first premolar cases: postretention evaluation of stability and relapse;Haruki;Angle Orthod,1998