S. Hamid Mirmohammadi and  Shahrazad Tamjidzad,  An Optimal Algorithm for Finding (r, Q) Policy in a Price-Dependent Order Quantity Inventory System with Soft Budget Constraint.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2015, vol. 103(7). 2462 - 2468
    [viewed 04 May 2024]. Available from: https://publications.waset.org/pdf/10002211.