@article{zheng2017an,
  title = {An Urban Metabolism and Carbon Footprint Analysis of the Jing–Jin–Ji Regional Agglomeration}
  author = {Zheng, Hongmei; Fath, Brian D.; Zhang, Yan},
  journal = {Factor X: Challenges, Implementation Strategies and Examples for a Sustainable Use of Natural Resources},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/jiec.12432},
  doi = {10.1111/jiec.12432},
  year = {2017}
}