List of Articles Eco-efficiency Open Access Article Abstract Page Full-Text 1 - Analysis of environmental efficiency and marginal rate of substitution in the presence of undesirable factors: A DEA-based approach Mansour Soufi Fatemeh Bozorgi Gerdvisheh Mahdi Homayounfar Alireza Amirteimoori Open Access Article Abstract Page Full-Text 2 - Eco-Efficiency in two-stage structure;A DDF Approach Monireh Zoriehhabib Mahnaz Maghbouli