https://www.efecon.tuiasi.ro/research-article/centralized-carbon-emission-abatement-cea-allocation-based-on-non-separation-using-data-envelopment-analysis-an-observation-of-regional-highway-transportation-systems-in-china/ EFECON Sun, 22 May 2022 17:37:18 +0000 hourly 1 https://wordpress.org/?v=6.1.1