KHDIR, M.K., TAHA, B.O. and ABDULRAHMAN, A.R. 2021. BEHAVIOR OF SQUARE REINFORCED CONCRETE COLUMNS STRENGTHENED BY DIFFERENT LAYERS OF GLASS FRP SHEETS. Journal of Duhok University. 23, 2 (Jan. 2021), 720-730. DOI:https://doi.org/10.26682/csjuod.2020.23.2.56.