1. A ten-year evaluation of the quality of orthodontic treatment;Ahlgren;Swed Dent J,1993
2. Occlusal outcome of orthodontic treatment;Al Yami;Angle Orthod,1998
3. An evaluation of factors affecting duration of orthodontic treatment;Beckwith;Am J Orthod Dentofac Orthop,1999
4. Die Bewertung von kieferorthopädischen Bchandlungs-ergebnissen;Berg;Inform Orthod and Kiefer-orthop,1990
5. Evaluation of treatrnent and post-treatment changes by the PAR Index;Birkeland;Eur J Orthod,1997