WASET
    Sung Kyu Kim and  Yong Soo Kim,  Evaluation Process for the Hardware Safety Integrity Level.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2013, vol. 76(4). 547 - 551
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/5621.