Chen, Duo, and Robert J. McGough. “Mode Scanning for Ultrasound Phased Arrays With Six Planes of Symmetry”. Canadian Acoustics 33, no. 3 (September 1, 2005): 90–91. Accessed November 27, 2022. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1759.