Das SK, Islam S. Multi-Objective Two Echelon Supply Chain Inventory Model with Lot Size and Customer Demand Dependent Purchase Cost and Production Rate Dependent Production Cost. Pak.j.stat.oper.res. [Internet]. 2019Dec.1 [cited 2025Sep.1];15(4):831-47. Available from: https://pjsor.com/pjsor/article/view/2929