Purnomo, C., L. Wu, J. Islam, G. de Boer, and B. Gick. “The Contextual Effects of Nasal Vowels on Velopharyngeal Opening in Quebecois French”. Canadian Acoustics, vol. 49, no. 3, Aug. 2021, pp. 46-47, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3910.