Wang, H., Y. Zhang, and S. Qin. “A Study on Ductility of Prestressed Concrete Pier Based on Response Surface Methodology”. Engineering, Technology & Applied Science Research 6, no. 6 (December 18, 2016): 1253–1257. Accessed June 30, 2024. https://etasr.com/index.php/ETASR/article/view/855.