WASET
    H. B. Mahmud and  Syamsul Bahri and  Y. W. Yee and  Y. T. Yeap ,  Effect of Rice Husk Ash on Strength and Durability of High Strength High Performance Concrete.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2016, vol. 111(3). 390 - 395
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10004076.