9Sheridan J. J,LeDoux W,McMinn R.Essix retainers: fabrication and supervision for permanent retention[].Journal of Clinical Orthodontics.1993
10Ayhan Enacar, DDS, PhD,,Bahadir Giray, at el.Facemask therapy with rigid anchorage in a patient with maxillary hypoplasia and severe oligodontia[].American Journal of Orthodontics and Dentofacial Orthopedics.2003