An, Van Viet Thien. “The Assessment of Concrete Quality by Ultrasonic Pulse Velocity”. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE 12, no. 5 (August 30, 2018): 20–27. Accessed September 18, 2026. https://stce.vjst.net/index.php/en/article/view/1242.