Pei, Lejun, Wenchao Zhang, and Li Wang. “Study on the Method of Detecting Voids Behind Subway Tunnel Lining: Data Segmentation of Continuous Impact Echo Signal”. International Core Journal of Engineering 11, no. 5 (April 22, 2025): 481–488. Accessed June 11, 2026. https://bcpublication.org/index.php/ICJE/article/view/8572.