Nigwal, A., U. K. Khedlekar, L. Sharma, and N. Gupta. “Trade Credit Policies for Supplier, Manufacturer, and Retailer: An Imperfect Production-Inventory System With Rework”. Journal of Mathematical and Fundamental Sciences, vol. 54, no. 1, June 2022, pp. 76-108, doi:10.5614/j.math.fund.sci.2022.54.1.5.