Tavio, P Pudjisuryadi, and P Suprobo. “Strength and Ductility of External Steel Collared Concrete Columns under Compressive Loading”. Journal of Asian Concrete Federation 1, no. 1 (September 30, 2015): 47–56. Accessed April 2, 2026. https://jacf.sfulib3.publicknowledgeproject.org/index.php/jacf/article/view/39.