C. B. K.Rao and  Rooban Kumar,  A Study on Behaviour of Normal Strength Concrete and High Strength Concrete Subjected to Elevated Temperatures.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2015, vol. 99(3). 283 - 287
    [viewed 17 October 2019]. Available from: https://publications.waset.org/pdf/10000763.