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M. Abdollahi and  S. N. Moghaddas Tafreshi,  Numerical Investigation on Performance of Expanded Polystyrene Geofoam Block in Protecting Buried Lifeline Structures.   journal   = {International Journal of Environmental, Chemical, Ecological, Geological and Geophysical Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2017, vol. 129(9). 770 - 777[viewed 25 June 2018]. Available from: http://waset.org/publications/10007857.