Anna Romanova and  Morteza A. Alani,  Monitoring CO2 and H2S Emission in Live Austrian and UK Concrete Sewer Pipes.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2015, vol. 100(4). 460 - 464
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/10001098.