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Loai Nasrat and  Mervat S. Hassan,  Effect of Bentonite on the Properties of Liquid Insulating Oil.   journal   = {International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 698 - 704[viewed 18 December 2017]. Available from: http://waset.org/publications/12227.