The Evaluation of Sustainable Development of BeijingTianjinHebei Ecological Supporting Area Based on Emergy Analysis——Taking Chengde as an Example
CHENG Fu wei, ZHANG Yuecong
JOURNAL OF HEBEI UNIVERSITY (Philosophy and Social Science) . 2016, (4): 106 -113 .  DOI: 10.3969/j.issn.1005-6378.2016.04.015