1. Treatment of irregularities of the permanent teeth;Angel;Dent Cosmos,1860
2. Rapid expansion of the maxillary dental arch and nasal cavity by opening the mid palatal suture;Haas;Angle Orthod,1961
3. Separation of the superior maxilla at the symphysis;Goddard;Dent Cosmos,1893
4. Indications for the expansion of the maxilla;Landsberger;Dent Cosmos,1910
5. The treatment of efficiency by opening the mid-palatal suture;Haas;Angle Orthod,1965