1. Velopharyngeal nomenclature: incompetence, inadequacy, insufficiency, and dysfunction;Folkins;Cleft Palate J.,1988
2. Velopharyngeal function and dysfunction;Jones;Clin. Commun. Disord.,1991
3. Types and causes of velopharyngeal dysfunction;Kummer;Semin. Speech Lang.,2011
4. Cleft Palate and Craniofacial Anomalies: Effects on Speech and Resonance;Kummer,2014
5. Velopharyngeal dysfunction: recommendations for use of nomenclature;Loney;Cleft Palate J.,1987