Das, Barun, Nirmal Kumar Mahapatra, and Manoranjan Maiti. “Initial‐valued first‐order Fuzzy Differential Equation in Bi‐level Inventory Model With Fuzzy Demand”. Mathematical Modelling and Analysis 13, no. 4 (December 31, 2008): 493-512. Accessed April 20, 2024. https://journals.vilniustech.lt/index.php/MMA/article/view/7037.