WASET
    Robert L. Burdett and  Bayan Bevrani,  A Mathematical Framework for Expanding a Railway’s Theoretical Capacity.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2015, vol. 107(11). 662 - 665
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/10002716.