Khadem, M. , Hossainpour, S. , Shams, M. (2008). 'Simulation of Roughness Shape and Distribution Effects on Rarefied and Compressible Flows at Slip Flow Regime'. World Academy of Science, Engineering and Technology, Open Science Index 17, International Journal of Mechanical and Mechatronics Engineering, 2(5), 633 - 638.