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Omar.S. Qaftan and  T. T. Sabbagh,  Experimental Simulation of Soil Boundary Condition for Dynamic Studies .   journal   = {International Journal of Environmental, Chemical, Ecological, Geological and Geophysical Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2017, vol. 129(9). 789 - 796[viewed 21 November 2017]. Available from: http://waset.org/publications/10007890.