Kayijuka Idrissa,  Mathematical Study for Traffic Flow and Traffic Density in Kigali Roads.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 123(3). 104 - 108
    [viewed 17 October 2019]. Available from: https://publications.waset.org/pdf/10006595.