Bahrami, A., W. H. Wan Badaruzzaman, and S. A. Osman. “Performance of Axially Loaded Tapered Concrete-Filled Steel Composite Slender Columns”. Journal of Civil Engineering and Management, vol. 19, no. 5, Oct. 2013, pp. 705-17, doi:10.3846/13923730.2013.799094.