M. Cort├ęs and  E. Vera and  O. Rojas,  Evaluation of Corrosion Caused by Biogenic Sulfuric Acid (BSA) on the Concrete Structures of Sewerage Systems (Chemical Tests).   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2014, vol. 95(11). 1116 - 1120
    [viewed 05 July 2020]. Available from: https://publications.waset.org/pdf/9999630.