List of Articles Portfolio 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 Open Access Article Abstract Page Full-Text 2 - Portfolio Optimization by Using Big Bang-Big Crunch Algorithm علیرضا علی نژاد Open Access Article Abstract Page Full-Text 3 - A Meta Heuristic Method Representation for Selection of Alternative Energy Production Methods Farshad Faezy Razi Abolfazl Danaei Rahele Sadat Khatami