J. HOŁA, “Determination of initiating and critical stress levels in compressed plain and high-strength concrete by acoustic methods”, Arch. Acoust., vol. 25, no. 1, pp. 57–65, Jan. 2000, Accessed: Apr. 25, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/352