Z. Abdollahnejad and  M. Kheradmand and  F. Pacheco Torgal,  Flow Performance of Hybrid Cement Based Mortars.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2017, vol. 129(9). 1233 - 1237
    [viewed 16 October 2019]. Available from: https://publications.waset.org/pdf/10007873.