Kelly, J. F., and R. J. McGough. “A Time-Space Decomposition Method for Fast Calculations of Transient Pressure Fields Generated by Ultrasound Phased Arrays”. Canadian Acoustics, vol. 33, no. 3, Sept. 2005, pp. 106-7, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1767.