WOSZCZYK, Wieslaw, et al. “Anechoic Measurements of Particle-Velocity Probes Compared to Pressure Gradient and Pressure Microphones”. Archives of Acoustics, vol. 32, no. 3, Apr. 2014, pp. 643-58, https://acoustics3.ippt.pan.pl/index.php/aa/article/view/716.