A. Md. Harunur Rashid B. Md. Keramat Ali Molla C. Tarif Uddin Ahmed,  Long Term Effect of Rice Husk Ash on Strength of Mortar.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2010, vol. 43(7). 180 - 183
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/11953.