Fitroni, Mochammad Rafqy Al, and Farida Pulansari. “Analysis of PVC-Based Product Inventory Control With Economic Production Quantity and Lagrange Multiplier Methods at PT. XYZ”. IJIEM - Indonesian Journal of Industrial Engineering and Management, vol. 5, no. 1, June 2024, pp. 148-57, doi:10.22441/ijiem.v5i1.22308.