List of Articles Simulated annealing Open Access Article Abstract Page Full-Text 1 - A new multi-mode and multi-product hub covering problem: A priority M/M/c queue approach S. Sedehzadeh‎ R. Tavakkoli-‎Moghaddam‎‎ F. Jolai‎ Open Access Article Abstract Page Full-Text 2 - A Multi-supplier Inventory Model with Permissible Delay in Payment and Discount M. Farhangi E. Mehdizadeh