“EFFECT OF CELLULAR CONCRETE BLOCKS AND TRANSVERSE INTERNAL RIBS ON SHEAR STRENGTH OF HOLLOW REINFORCED CONCRETE BEAMS”. Journal of Engineering and Sustainable Development, vol. 19, no. 5, Sept. 2015, pp. 174-89, https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/822.