WASET
    P. K. Sarkar and  Amit Kumar Jain,  Elasticity Model for Easing Peak Hour Demand for Metrorail Transport System.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2016, vol. 115(7). 2462 - 2468
    [viewed 09 May 2024]. Available from: https://publications.waset.org/pdf/10005070.