Rvachew, S., D. Creighton, N. Feldman, and R. Sauve. “Description of Speech Produced by Infants With Bronchopulmonary Dysplasia: Methodological Issues and Preliminary Data”. Canadian Acoustics, vol. 27, no. 3, Sept. 1999, pp. 82-83, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1228.