Mohamed Ibrahim, Amer, Murtada Amer Ismael, and Humam Abdul Satar Abdul Hussein. 2019. “THE EFFECT OF BALLS SHAPES AND SPACING ON STRUCTURAL BEHAVIOUR OF REINFORCED CONCRETE BUBBLED SLABS”. Journal of Engineering and Sustainable Development 23 (2): 56-65. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/276.