WASET
    Suparna Karmakar and  Ranjan Dasgupta,  A Petri Net Representation of a Web-Service- Based Emergency Management System in Railway Station.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2011, vol. 59(11). 1417 - 1423
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/12204.