Benson Chizubem,  Indicators as Early Warning Signal Performance to Solve Underlying Safety Problem before They Emerge as Accident Risks.   journal   = {International Journal of Industrial and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2023, vol. 195(3). 104 - 109
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10013014.