WASET
    Dubbale Daniel A. and  Tsutsumi J.,  Effective Density for the Classification of Transport Activity Centers.   journal   = {International Journal of Transport and Vehicle Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2010, vol. 42(6). 170 - 175
    [viewed 10 May 2024]. Available from: https://publications.waset.org/pdf/3726.