List of Articles Multi-objective programming 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 approach to solving multi-follower multi-objective linear bilevel programming problems Habibe Sadeghi Farzaneh Anis Hosseini 10.22094/joie.2022.543647.1512