Abdulhussein, A. A., and M. H. Al-Sherrawi. “Experimental and Numerical Analysis of the Punching Shear Resistance Strengthening of Concrete Flat Plates by Steel Collars”. Engineering, Technology & Applied Science Research, vol. 11, no. 6, Dec. 2021, pp. 7853-60, doi:10.48084/etasr.4497.