a fuzzy solution approach to supplier selection and order allocation in green supply chain considering the location-routing problem

In the field of supply chain, selecting a suitable green supplier could significantly help us to decrease the cost and the risk involved in the operations as well as increase in the quality and green. in this paper, we develop an integrated two-stage approach based on fuzzy analytic hierarchy process (fahp) and multi - objective mixed-integer linear programming to select suppliers and order allocation in green supply chain. in the first stage, suppliers are evaluated using fahp method, and in the second stage, a multi-product multi-period supply chain considering green location- routing problem, discounting, and time window under uncertainty is developed. then, a fuzzy solution approach is applied to solve proposed model using the data of a pharmaceutical chain in iran. results will verify the efficiency of the proposed model.