1. Use of Nasometry as a Diagnostic Tool for Identifying Patients with Velopharyngeal Impairment
2. Fletcher SG, Adams LE, McCutcheon MJ. Communicative disorders related to cleft lip and palate: Cleft palate speech assessment through oral-nasal acoustic measures, 3rd ed., KR Bzoch. A College-Hill Publication. Little, Brown and Co, Boston 1989; 246–257
3. A Simple Clinical Method of Evaluating Perceived Hypernasality
4. Nasalance Scores in Normal Finnish Speech