Cai Guoqiang and  Jia Limin and  Zhou Liming and  Liang yu and  Li xi,  Research on Rail Safety Security System.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2010, vol. 44(8). 1938 - 1943
    [viewed 08 April 2020]. Available from: https://publications.waset.org/pdf/11857.