@article{zhu2019ecological,
  title = {Ecological network analysis of urban energy metabolic system—A case study of Beijing}
  author = {Zhu, Xueting; Mu, Xianzhong; Hu, Guangwen},
  journal = {Ecological Modelling},
  url = {http://www.sciencedirect.com/science/article/pii/S0304380019301619},
  doi = {10.1016/j.ecolmodel.2019.04.016},
  year = {2019}
}