S. Shakibaei and  P. Alpkokin,  Deregulation of Turkish State Railways Based on Public-Private Partnership Approaches.   journal   = {International Journal of Transport and Vehicle Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2017, vol. 129(9). 1303 - 1309
    [viewed 22 January 2022]. Available from: https://publications.waset.org/pdf/10007992.