Gavrilov, Aleksandr, Grigoriy Grebenyuk, Nikolay Morozov, and Andrey Grehov. “Free Vibrations of Thin-Walled Box-Section Bars Allowing for Shear Strains”. International Journal of Engineering & Technology 7, no. 2.13 (April 15, 2018): 7–12. Accessed May 2, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/11570.