Buda-Ożóg, Lidia, and Władysław Łakota. “Cracking and Failure Estimation of Reinforced Concrete Beams on the Basis of Dynamic Characteristics”. Computer Assisted Methods in Engineering and Science, vol. 14, no. 2, Aug. 2022, pp. 159-66, https://cames3.ippt.pan.pl/index.php/cames/article/view/823.