WASET
    Colette Malyack and  Pius Egbelu,  Analysis of the Omnichannel Delivery Network with Application to Last Mile Delivery.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2021, vol. 172(4). 442 - 447
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10011965.