Konstantinos Sotiriadis and  Olesia Mikhailova,  Study of Fly Ash Geopolymer Based Composites with Polyester Waste Addition.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2015, vol. 100(4). 550 - 553
    [viewed 15 September 2019]. Available from: https://publications.waset.org/pdf/10000992.