Salamat Bakhsh,A R , , Tavakkoli-Moghaddam,R , , Alinaghian,M , and Najafi,I . "A Scenario-Based Robust Optimization Model for a Periodic Vehicle Routing Problem with Time Windows under Uncertainty by Using a Differential Evolution Algorithm", Advances in Industrial Engineering, 52, 1, 2018, 73-86. doi: 10.22059/jieng.2018.229667.1345