WASET
    G. M. Arun Prasath and  N. Arthi,  Optimal Network of Secondary Warehouses for Production-Distribution Inventory Model.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 103(7). 448 - 452
    [viewed 09 May 2024]. Available from: https://publications.waset.org/pdf/10003705.