Raghavendra, D., K. Sivasubramanian, A. Sivakumar, and M. Hareesh. “Experimental Evaluation of Crack Depth in Concrete Specimens Using Time-of-Flight Technique”. Journal of Structural Engineering, vol. 43, no. 3, Nov. 2024, pp. 311-8, http://14.139.176.44/index.php/JOSE/article/view/855.