Z. Abdollahnejad and  P. Torgal and  J. Barroso Aguiar,  Compressive Strength and Microstructure of Hybrid Alkaline Cements.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2014, vol. 86(2). 221 - 227
    [viewed 21 May 2022]. Available from: https://publications.waset.org/pdf/9997691.