Dr.K.Thirugnanasambandam, Mr. V. Sivan. “Deteriorating Inventory Planning Model With Rectangular and Triangular Distributed Demand of Fully Backlogged Shortages”. International Journal of Advanced Science and Technology, Vol. 29, no. 7s, June 2020, pp. 4617 -29, https://sersc.org/journals/index.php/IJAST/article/view/25701.