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Aeslina Binti Abdul Kadir and  Ahmad Shayuti Bin Abdul Rahim,  An Overview of Sludge Utilization into Fired Clay Brick .   journal   = {International Journal of Environmental, Chemical, Ecological, Geological and Geophysical Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2014, vol. 92(8). 567 - 571[viewed 20 October 2018]. Available from: http://waset.org/publications/9999086.