Aziz, Riyadh, Laith Al-Hadithy, and Shayma Resen. 2017. “Finite Element Modelling of Concrete Filled Double Skin Steel Tubular Columns under Cyclic Axial Compression Load”. Al-Nahrain Journal for Engineering Sciences 20 (2), 326-40. https://nahje.com/index.php/main/article/view/112.