@article{cui2019examining, title = {Examining urban metabolism: A material flow perspective on cities and their sustainability} author = {Cui, Xuezhu; Wang, Xuetong; Feng, Yunyu}, journal = {Journal of Cleaner Production}, url = {http://www.sciencedirect.com/science/article/pii/S0959652619300277}, doi = {10.1016/j.jclepro.2019.01.021}, year = {2019} }