Ferdi Sönmez and  Nihal Yorulmaz,  Effective Planning of Public Transportation Systems: A Decision Support Application.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2018, vol. 143(11). 995 - 1003
    [viewed 08 December 2021]. Available from: https://publications.waset.org/pdf/10009803.