Kanagajothi, D., S. Srinivasaragavan, and S. Parvathi. “Universal Study of Three Product Inventory Model With Production by Two-Unit System and Sales”. International Journal of Engineering and Technology 7, no. 3.24 (August 10, 2018): 404–408. Accessed May 12, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/22696.