WASET
    T. Valdbjørn Rasmussen,  Design Criteria for Achieving Acceptable Indoor Radon Concentration .   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2016, vol. 111(3). 313 - 318
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/10003891.