List of Articles bi-level game Open Access Article Abstract Page Full-Text 1 - Determining the Optimum Investment Portfolios in the Iranian Banking Network Base on Bi-level Game using the Markowitz Optimization Model by Firefly Algorithm Mehdi Memarpour Ashkan Hafezalkotob Mohammad Khalilzadeh Abbas Saghaei Roya Soltani 20.1001.1.25382756.2021.6.3.1.2