Ahmed, A. M., Z. Muazu, Y. Jibril, A. Hamisu, D. A. Muhammad, and B. Bature. “An Order Quantity Model for Delayed Deteriorating Items With Time-Varying Demand Rate and Holding Cost, Time Dependent Partial Backlogging Rate, and Two-Level Pricing Strategies under Trade Credit Policy”. UMYU Scientifica, vol. 4, no. 2, May 2025, pp. 32-48, doi:10.56919/usci.2542.005.