1. Bergeron RT, Osborn AG, Sam PM (1984) Head and neck imaging. CV Mosby, St Louis
2. Bosma JF, Truby HM, Lind J (1966) Distortions of the upper respiratory and swallowing motions in infant having anomalies of the upper pharynx. Acta Paediatr Scand 163:111–128
3. Cantarella G (1998) Definizione ed epidemiologia dei disturbi della deglutizione. Centro Richerce e Sudi Amplifon, Raccolta bibliografica Seminario Turbe della deglutizione: attualità diagnostiche e terapeutiche, pp 12–17
4. Croft CB et al (1981) Patterns of velopharyngeal valving in normal and cleft palate subjects: a multi view videofluoroscopic and nasoendoscopic study. Laryngoscope 91:265–271
5. Dalston RM et al (1985) The diagnosis of velopharyngeal insufficiency. Clin Plastic Surg 12:685–695