Kaminski, Mieczysław, Michał Musiał, and Andrzej Ubysz. “Eigenfrequencies of the Reinforced Concrete Beams – Methods of Calculations”. Journal of Civil Engineering and Management 17, no. 2 (July 12, 2011): 278-283. Accessed November 22, 2024. https://jeelm.vgtu.lt/index.php/JCEM/article/view/5162.