Kołakowski, Z., and M. Królak. “Interactive Elastic Buckling of Thin-Walled Closed Orthotropic Beam-Columns”. Engineering Transactions 43, no. 4 (December 31, 1995): 571–590. Accessed April 24, 2025. https://et3.ippt.pan.pl/index.php/et/article/view/1518.