Zhang, X., M. Clayards, and R. Bouserhal. “The Effect of Vowel Lengthening on the Intelligibility of Occluded Lombard Speech”. Canadian Acoustics, vol. 50, no. 3, Aug. 2022, pp. 86-87, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3884.