%0 Journal Article %A Azimi, Parham, Asadollahi, Abulfazl %T Developing a New Bi-Objective Functions Model for a Hierarchical Location-Allocation Problem Using the Queuing Theory and Mathematical Programming %J Journal of Optimization in Industrial Engineering %V 12 %N 2 %P 149-154 %D 2019 %R 10.22094/joie.2018.350.0 %U https://sanad.iau.ir/fa/Article/950582