WASET
    Ulrica Pettersson,  Improved Safety Science: Utilizing a Design Hierarchy.   journal   = {International Journal of Industrial and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2017, vol. 121(1). 273 - 278
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/10007425.