1. Rapid expansion of the maxillary dental arch and nasal cavity by opening the midpalatal suture;Haas;Angle Orthod,1961
2. The treatment of maxillary deficiency by opening the midpalatal suture;Haas;Angle Orthod,1965
3. Expansion of the midpalatal suture studied by means of metallic implants;Krebs;Acta Odontol Scand,1959
4. Rapid expansion of midpalatal suture by fixed appliance: an implant study over a 7 year period;Krebs;Trans Eur Orthod Soc,1964
5. Skeletal and dental changes accompanying rapid midpalatal suture opening;Wertz;Am J Orthod,1970