KHDIR, M. K., B. O. TAHA, and A. R. ABDULRAHMAN. “BEHAVIOR OF SQUARE REINFORCED CONCRETE COLUMNS STRENGTHENED BY DIFFERENT LAYERS OF GLASS FRP SHEETS”. Journal of Duhok University, Vol. 23, no. 2, Jan. 2021, pp. 720-3, https://journal.uod.ac/index.php/uodjournal/article/view/973.