Dimitra Alexiou and  Stefanos Katsavounis and  Ria Kalfakakou,  Finding Viable Pollution Routes in an Urban Network under a Predefined Cost.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 88(4). 975 - 977
    [viewed 25 October 2021]. Available from: https://publications.waset.org/pdf/9997925.