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Shubbar, A. , Alwan, H. , Phur, E. , McLoughlin, J. , Al-khaykan, A.. "Studying the Structural Behaviour of RC Beams with Circular Openings of Different Sizes and Locations Using FE Method". World Academy of Science, Engineering and Technology, Open Science Index 127, International Journal of Structural and Construction Engineering, (2017), 11(7), 916 - 919.