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Kolay P. K. and  Singh H.,  Geochemistry of Coal Ash in the Equatorial Wet Disposal System Environment.   journal   = {International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2013, vol. 73(1). 83 - 86[viewed 24 April 2018]. Available from: http://waset.org/publications/9996742.