List of Articles Delay in Payment Open Access Article Abstract Page Full-Text 1 - Optimal Inventory Control of Obsolete Products with Permissible Delay in Payments and Time-dependent Demand using PSO Algorithm Hasan Zamanibajgani Mohamadreza Gholamian Open Access Article Abstract Page Full-Text 2 - A production-inventory model with permissible delay incorporating learning effect in random planning horizon using genetic algorithm Mohuya B. Kar Shankar Bera Debasis Das Samarjit Kar Open Access Article Abstract Page Full-Text 3 - An EOQ model for non-instantaneous deteriorating items with two levels of storage under trade credit policy R. Udayakumar K. V. Geetha Open Access Article Abstract Page Full-Text 4 - Inventory model with composed shortage and permissible delay in payment linked to order quantity H Saiedy M Bamani Moghadam