1. A spectrographic study of hypernasality;Bloomer;Cleft Palate Bulletin,1956
2. Speech evaluation of cleft lip and palate;Bowman,1990
3. Severity of nasality in three selected speech tasks;Carney;Journal of Speech and Hearing Research,1971
4. The effect of changes in width in velopharyngeal aperture on acoustic and perceptual properties of vowels;Coleman,1963
5. Oral and nasal sound pressure measures;Counihan,1971