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2. Orthodontic procedures in the treatment of congenital cleft palate;McNeil;Dent Record,1950
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4. Early maxillary orthopedics: a sequence of events;Rosenstein;Cleft Palate J,1967
5. The influence of lip function on the sagittal and transversal development of the maxilla in cleft patients;Göz;Scand J Plast ReConstr Surg Hand Surg,1987