Lien TV, Hao TA. Determination of mode shapes of a multiple cracked beam element and its application for free vibration analysis of a multi-span continuous beam. Vietnam J. Mech. [Internet]. 2013 Nov. 22 [cited 2024 Apr. 27];35(4):313-2. Available from: https://vjs.ac.vn/index.php/vjmech/article/view/2520