List of Articles Location-allocation problem Open Access Article Abstract Page Full-Text 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 20.1001.1.22519904.2019.12.2.12.1 Open Access Article Abstract Page Full-Text 2 - A New Hybrid Algorithm to Optimize Stochastic-fuzzy Capacitated Multi-Facility Location-allocation Problem Esmaeil Mehdizadeh Mohammad Reza Tavarroth Vahid Hajipour