Shu, Lei, Xufeng Zhu, Xiwei Huang, ZhangBing Zhou, Yu Zhang, and Xiaolei Wang. 2015. “A Review of Research on Acoustic Detection of Heat Exchanger Tube”. EAI Endorsed Transactions on Industrial Networks and Intelligent Systems 2 (5):e5. https://publications.eai.eu/index.php/inis/article/view/501.