LU, Xiaodan, and Deping ZENG. “Design and Verification of Sector Vortex Archimedean Spiral Phased Array Transducer for Improving Focus Acoustic Pressure”. Archives of Acoustics, vol. 49, no. 1, Jan. 2024, pp. 73–81, https://doi.org/10.24425/aoa.2024.148769.