List of Articles weak disposability Open Access Article Abstract Page Full-Text 1 - A new non-radial DEA-R model to measure the effects of undesirable outputs on the efficiency of production units جواد گرامی Open Access Article Abstract Page Full-Text 2 - Designing a Fuzzy Network Model to Evaluate the Efficiency of Oil and Gas Production Centers in the Country Based on Undesirable Outputs Mehrab Hasanvand Mohammad Taleghani Behrouz Fathi Vajargah Open Access Article Abstract Page Full-Text 3 - A data-based comparison of the two undesirable output disposability approaches in environmental efficiency Azam Pourhabib Yekta Mahnaz Maghbouli Monireh Zorriehhabib