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Togun, H. , Abdulrazzaq, T. , Kazi, S. , Badarudin, A. , Ariffin, M. , Zubir, M.. "Numerical Study of Heat Transfer and Laminar Flow over a Backward Facing Step with and without Obstacle". World Academy of Science, Engineering and Technology, Open Science Index 86, International Journal of Aerospace and Mechanical Engineering (2014), 8(2), 363 - 367.