Victor Yossif, Wisam. “Bowing Effect on Elastic Stability for Members Having Concave Configuration Shapes”. Journal of Engineering and Sustainable Development 11, no. 3 (December 1, 2007): 167–193. Accessed July 5, 2025. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1753.