1. The treatment of maxillary deficiency by opening the midpalatal suture;Haas;Angle Orthodontist,1965
2. Treatment of irregularity of the permanent or adult teeth;Angell;Dental Cosmos,1860
3. Maxillary expansion: a meta analysis
4. Orthodontic treatment for posterior crossbites;Harrison;Cochrane Database of Systematic Reviews,2002
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