List of Articles Open Access Article Abstract Page Full-Text 1 - A data-based comparison of the two undesirable output disposability approaches in environmental efficiency Azam Pourhabib Yekta Mahnaz Maghbouli Monireh Zorriehhabib Open Access Article Abstract Page Full-Text 2 - A survey of hybrid meta heuristic methods to solve location routing problems مهدی فضلی somayyeh faraji amoogin Open Access Article Abstract Page Full-Text 3 - Generation Expansion Planning with presenting a two-level model in order to cover the uncertainty in the competitive market Saeed Shahbazian Saeed Kharrati Abdollah Rastgou