Bird, S. (2010) “An Ultrasound Investigation of Possible Covert Contrasts in First Language Acquisition: The Case of /sp ~ sw ~ sm/ > [f] Mergers”, Canadian Acoustics, 38(3), pp. 118–119. Available at: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2273 (Accessed: 28 March 2024).