Khoa Tan Nguyen and  Tuan Anh Le and  Kihak Lee,  Experimental Study on Flexural Strength of Reinforced Geopolymer Concrete Beams.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 112(4). 516 - 520
    [viewed 23 October 2019]. Available from: https://publications.waset.org/pdf/10004196.