@article{liu2010extended, title = {Extended exergy-based urban ecosystem network analysis: a case study of Beijing, China} author = {Liu, Gengyuan; Yang, Zhifeng; Chen, Bin}, journal = {Procedia Environmental Sciences}, url = {http://www.sciencedirect.com/science/article/pii/S1878029610000629}, doi = {10.1016/j.proenv.2010.10.029}, year = {2010} }