Maciel HM, Khan AS. The Eco-efficiency Index at the international level:: a comparative analysis of the performance of 51 countries between 1991 and 2012. SustDeb [Internet]. 2017 Apr. 30 [cited 2024 Nov. 23];8(1):125-40. Available from: https://periodicos.unb.br/index.php/sust/article/view/16463