Pratama, R., A. Widarman, and H. Sandi Yudha. “Reassessing EOQ-Based Brown Clay Inventory Control for NPK Fertilizer Production: Model Validation and Scenario Analysis”. BRIDGE : The Multidisciplinary Research Portal, vol. 4, no. 1, Jan. 2026, pp. 382-93, https://jurnal.sttnlampung.ac.id/index.php/bridge/article/view/197.