Abhinandan Singh Gill,  Ingenious Use of Hypo Sludge in M25 Concrete.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2014, vol. 96(12). 1341 - 1346
    [viewed 07 December 2019]. Available from: https://publications.waset.org/pdf/10005745.