Hong, S. U., Lee, Y. T., Kim, S. H., Lee, C. S. (2016), Estimation of Thickness of
Concrete Structures using the Impact Echo Method and Ultrasonic Pulse Velocity Method,
Architectural Research, AIK, Estimation of Thickness of Concrete Structures using
the Impact Echo Method and Ultrasonic Pulse Velocity Method, Architectural Research,
AIK 18(4), 179-184. 10.5659/AIKAR.2016.18.4.179, 18(4), 179-184.