Ndukum, P. L. ., L. T. . Encho, M. . Soh, and A. . Okolo. “Optimal Ordering Quantity by Retailer from Supplier With Transportation Cost in a Supply Chain”. JOURNAL OF ADVANCES IN MATHEMATICS, vol. 23, Apr. 2024, pp. 74-83, doi:10.24297/jam.v23i.9602.