فهرس المقالات Location-Allocation Problems حرية الوصول المقاله صفحة الملخص نص كامل 1 - Developing a New Bi-Objective Functions Model for a Hierarchical Location-Allocation Problem Using the Queuing Theory and Mathematical Programming Parham Azimi Abulfazl Asadollahi 10.22094/joie.2018.350.0