Michael Todinov and  Eberechi Weli,  Optimal Risk Reduction in the Railway Industry by Using Dynamic Programming.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2013, vol. 79(7). 1342 - 1346
    [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/16291.