Hamzaoui, L., and T. Bouzid. “The Proposition of an EI Equation of Square and L–Shaped Slender Reinforced Concrete Columns under Combined Loading”. Engineering, Technology & Applied Science Research 11, no. 3 (June 12, 2021): 7100–7106. Accessed June 30, 2022. https://etasr.com/index.php/ETASR/article/view/4048.