Sangoju, Bhaskar, and K. Ramanjaneyulu. “Evaluation of Thickness and Identification of Defects in Masonry Elements Using Impact-Echo Technique”. Journal of Structural Engineering 42, no. 6 (March 4, 2025): 485–493. Accessed April 4, 2025. http://jose.serc.res.in/index.php/JOSE/article/view/1196.