Flowers, H., T. Bressmann, B. Carmichael, C.-L. Heng, and W. Wong. “Reconstructing Three-Dimensional Tongue Trajectories Using Multiplanar Paced Sonography”. Canadian Acoustics, vol. 33, no. 4, Dec. 2005, pp. 50-51, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1779.