1. Retention;Reidel,1969
2. Stability of mandibular intercuspid width after long periods of retention;Herberger;Angle Orthod.,1981
3. Treatment of irregularity of the permanent or adult teeth;Angell;Dent. Cosmos,1860
4. Experiences on widening the median maxillary suture;Thörne;Trans. Eur. Orthod. Soc.,1956
5. Long term follow-up of cases treated by rapid maxillary expansion;Timms;Trans. Eur. Orthod. Soc.,1976